diff --git a/Dockerfile b/Dockerfile
index 0c2d5b1..5679da8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,19 +16,22 @@ RUN apk --update add \
       php7-openssl \
       php7-pcntl \
       php7-phar \
+      php7-simplexml \
       php7-sockets \
+      php7-tokenizer \
+      php7-xmlwriter \
       php7-xml && \
     rm /var/cache/apk/* && \
-    ln -s /usr/bin/php7 /usr/bin/php
+    ln -sf /usr/bin/php7 /usr/bin/php
 
 COPY composer.* ./
 
 RUN apk --update add curl && \
     curl -sS https://getcomposer.org/installer | php && \
     ./composer.phar install && \
+    mv composer.phar /usr/local/bin/composer && \
     apk del curl && \
-    rm /usr/src/app/composer.phar \
-       /var/cache/apk/*
+    rm /var/cache/apk/*
 
 COPY bin/build-content ./bin/build-content
 
diff --git a/Makefile b/Makefile
index 031dabf..70e341b 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,7 @@ composer-update:
 	  --rm \
 	  --volume $(PWD)/composer.json:/usr/src/app/composer.json:ro \
 	  $(IMAGE_NAME) \
-	  sh -c 'php composer.phar update && cat composer.lock' > composer.lock
+	  sh -c 'cd /usr/src/app && composer update && cat composer.lock' > composer.lock
 
 citest:
 	docker run --rm $(IMAGE_NAME) sh -c "cd /usr/src/app && vendor/bin/phpunit --bootstrap engine.php ./tests"
diff --git a/Runner.php b/Runner.php
index abaeb7c..db437b9 100644
--- a/Runner.php
+++ b/Runner.php
@@ -92,7 +92,13 @@ public function run($files)
             $phpmd = new PHPMD();
 
             if (isset($this->config['config']['file_extensions'])) {
-                $phpmd->setFileExtensions(explode(',', $this->config['config']['file_extensions']));
+                $fileExtensions = $this->config['config']['file_extensions'];
+
+                if (is_string($fileExtensions)) {
+                    $fileExtensions = explode(',', $fileExtensions);
+                }
+
+                $phpmd->setFileExtensions($fileExtensions);
             }
 
             $rulesets = Runner::RULESETS;
diff --git a/composer.lock b/composer.lock
index d74e245..8faafe5 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,21 +4,20 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "340d702b45a0bfce1a6cd8142423cb82",
     "content-hash": "179e47f429a63091c12ac2db403ed38e",
     "packages": [
         {
             "name": "barracudanetworks/forkdaemon-php",
-            "version": "v1.0.9",
+            "version": "v1.0.10",
             "source": {
                 "type": "git",
                 "url": "https://github.com/barracudanetworks/forkdaemon-php.git",
-                "reference": "06462cffb0181514ce2559615f0e892731919187"
+                "reference": "6675af59d017afc3bbb32af1c0844353f1b7666a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/barracudanetworks/forkdaemon-php/zipball/06462cffb0181514ce2559615f0e892731919187",
-                "reference": "06462cffb0181514ce2559615f0e892731919187",
+                "url": "https://api.github.com/repos/barracudanetworks/forkdaemon-php/zipball/6675af59d017afc3bbb32af1c0844353f1b7666a",
+                "reference": "6675af59d017afc3bbb32af1c0844353f1b7666a",
                 "shasum": ""
             },
             "require": {
@@ -41,20 +40,20 @@
                 "forking",
                 "php"
             ],
-            "time": "2016-06-21 18:44:21"
+            "time": "2017-03-28T17:06:09+00:00"
         },
         {
             "name": "pdepend/pdepend",
-            "version": "2.3.2",
+            "version": "2.5.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/pdepend/pdepend.git",
-                "reference": "8d7ab8fe8c1f9de5056bb7ea2c0852f4ddd44f90"
+                "reference": "0c50874333149c0dad5a2877801aed148f2767ff"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/pdepend/pdepend/zipball/8d7ab8fe8c1f9de5056bb7ea2c0852f4ddd44f90",
-                "reference": "8d7ab8fe8c1f9de5056bb7ea2c0852f4ddd44f90",
+                "url": "https://api.github.com/repos/pdepend/pdepend/zipball/0c50874333149c0dad5a2877801aed148f2767ff",
+                "reference": "0c50874333149c0dad5a2877801aed148f2767ff",
                 "shasum": ""
             },
             "require": {
@@ -81,24 +80,25 @@
                 "BSD-3-Clause"
             ],
             "description": "Official version of pdepend to be handled with Composer",
-            "time": "2016-11-23 20:25:02"
+            "time": "2017-01-19T14:23:36+00:00"
         },
         {
             "name": "phpmd/phpmd",
-            "version": "2.5.0",
+            "version": "2.6.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpmd/phpmd.git",
-                "reference": "9298602a922cd8c46666df8d540a60bc5925ce55"
+                "reference": "4e9924b2c157a3eb64395460fcf56b31badc8374"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpmd/phpmd/zipball/9298602a922cd8c46666df8d540a60bc5925ce55",
-                "reference": "9298602a922cd8c46666df8d540a60bc5925ce55",
+                "url": "https://api.github.com/repos/phpmd/phpmd/zipball/4e9924b2c157a3eb64395460fcf56b31badc8374",
+                "reference": "4e9924b2c157a3eb64395460fcf56b31badc8374",
                 "shasum": ""
             },
             "require": {
-                "pdepend/pdepend": "^2.0.4",
+                "ext-xml": "*",
+                "pdepend/pdepend": "^2.5",
                 "php": ">=5.3.9"
             },
             "require-dev": {
@@ -146,20 +146,20 @@
                 "phpmd",
                 "pmd"
             ],
-            "time": "2016-11-23 20:33:32"
+            "time": "2017-01-20T14:41:10+00:00"
         },
         {
             "name": "symfony/config",
-            "version": "v3.2.1",
+            "version": "v3.2.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/config.git",
-                "reference": "b4ec9f099599cfc5b7f4d07bb2e910781a2be5e4"
+                "reference": "e5533fcc0b3dd377626153b2852707878f363728"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/config/zipball/b4ec9f099599cfc5b7f4d07bb2e910781a2be5e4",
-                "reference": "b4ec9f099599cfc5b7f4d07bb2e910781a2be5e4",
+                "url": "https://api.github.com/repos/symfony/config/zipball/e5533fcc0b3dd377626153b2852707878f363728",
+                "reference": "e5533fcc0b3dd377626153b2852707878f363728",
                 "shasum": ""
             },
             "require": {
@@ -202,20 +202,20 @@
             ],
             "description": "Symfony Config Component",
             "homepage": "https://symfony.com",
-            "time": "2016-12-09 07:45:17"
+            "time": "2017-04-12T14:13:17+00:00"
         },
         {
             "name": "symfony/dependency-injection",
-            "version": "v3.2.1",
+            "version": "v3.2.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/dependency-injection.git",
-                "reference": "037054501c41007c93b6de1b5c7a7acb83523593"
+                "reference": "5e00857475b6d1fa31ff4c76f1fddf1cfa9e8d59"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/dependency-injection/zipball/037054501c41007c93b6de1b5c7a7acb83523593",
-                "reference": "037054501c41007c93b6de1b5c7a7acb83523593",
+                "url": "https://api.github.com/repos/symfony/dependency-injection/zipball/5e00857475b6d1fa31ff4c76f1fddf1cfa9e8d59",
+                "reference": "5e00857475b6d1fa31ff4c76f1fddf1cfa9e8d59",
                 "shasum": ""
             },
             "require": {
@@ -265,20 +265,20 @@
             ],
             "description": "Symfony DependencyInjection Component",
             "homepage": "https://symfony.com",
-            "time": "2016-12-08 15:27:33"
+            "time": "2017-04-26T01:39:17+00:00"
         },
         {
             "name": "symfony/filesystem",
-            "version": "v3.2.1",
+            "version": "v3.2.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/filesystem.git",
-                "reference": "8d4cf7561a5b17e5eb7a02b80d0b8f014a3796d4"
+                "reference": "040651db13cf061827a460cc10f6e36a445c45b4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/filesystem/zipball/8d4cf7561a5b17e5eb7a02b80d0b8f014a3796d4",
-                "reference": "8d4cf7561a5b17e5eb7a02b80d0b8f014a3796d4",
+                "url": "https://api.github.com/repos/symfony/filesystem/zipball/040651db13cf061827a460cc10f6e36a445c45b4",
+                "reference": "040651db13cf061827a460cc10f6e36a445c45b4",
                 "shasum": ""
             },
             "require": {
@@ -314,7 +314,7 @@
             ],
             "description": "Symfony Filesystem Component",
             "homepage": "https://symfony.com",
-            "time": "2016-11-24 00:46:43"
+            "time": "2017-04-12T14:13:17+00:00"
         }
     ],
     "packages-dev": [
@@ -370,20 +370,20 @@
                 "constructor",
                 "instantiate"
             ],
-            "time": "2015-06-14 21:17:01"
+            "time": "2015-06-14T21:17:01+00:00"
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.5.5",
+            "version": "1.6.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "399c1f9781e222f6eb6cc238796f5200d1b7f108"
+                "reference": "8e6e04167378abf1ddb4d3522d8755c5fd90d102"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/399c1f9781e222f6eb6cc238796f5200d1b7f108",
-                "reference": "399c1f9781e222f6eb6cc238796f5200d1b7f108",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/8e6e04167378abf1ddb4d3522d8755c5fd90d102",
+                "reference": "8e6e04167378abf1ddb4d3522d8755c5fd90d102",
                 "shasum": ""
             },
             "require": {
@@ -412,7 +412,7 @@
                 "object",
                 "object graph"
             ],
-            "time": "2016-10-31 17:19:45"
+            "time": "2017-04-12T18:52:22+00:00"
         },
         {
             "name": "phpdocumentor/reflection-common",
@@ -466,7 +466,7 @@
                 "reflection",
                 "static analysis"
             ],
-            "time": "2015-12-27 11:43:31"
+            "time": "2015-12-27T11:43:31+00:00"
         },
         {
             "name": "phpdocumentor/reflection-docblock",
@@ -511,7 +511,7 @@
                 }
             ],
             "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
-            "time": "2016-09-30 07:12:33"
+            "time": "2016-09-30T07:12:33+00:00"
         },
         {
             "name": "phpdocumentor/type-resolver",
@@ -558,31 +558,31 @@
                     "email": "me@mikevanriel.com"
                 }
             ],
-            "time": "2016-11-25 06:54:22"
+            "time": "2016-11-25T06:54:22+00:00"
         },
         {
             "name": "phpspec/prophecy",
-            "version": "v1.6.2",
+            "version": "v1.7.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "6c52c2722f8460122f96f86346600e1077ce22cb"
+                "reference": "93d39f1f7f9326d746203c7c056f300f7f126073"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/6c52c2722f8460122f96f86346600e1077ce22cb",
-                "reference": "6c52c2722f8460122f96f86346600e1077ce22cb",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/93d39f1f7f9326d746203c7c056f300f7f126073",
+                "reference": "93d39f1f7f9326d746203c7c056f300f7f126073",
                 "shasum": ""
             },
             "require": {
                 "doctrine/instantiator": "^1.0.2",
                 "php": "^5.3|^7.0",
                 "phpdocumentor/reflection-docblock": "^2.0|^3.0.2",
-                "sebastian/comparator": "^1.1",
-                "sebastian/recursion-context": "^1.0|^2.0"
+                "sebastian/comparator": "^1.1|^2.0",
+                "sebastian/recursion-context": "^1.0|^2.0|^3.0"
             },
             "require-dev": {
-                "phpspec/phpspec": "^2.0",
+                "phpspec/phpspec": "^2.5|^3.2",
                 "phpunit/phpunit": "^4.8 || ^5.6.5"
             },
             "type": "library",
@@ -621,39 +621,39 @@
                 "spy",
                 "stub"
             ],
-            "time": "2016-11-21 14:58:47"
+            "time": "2017-03-02T20:05:34+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "4.0.4",
+            "version": "4.0.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "c14196e64a78570034afd0b7a9f3757ba71c2a0a"
+                "reference": "ef7b2f56815df854e66ceaee8ebe9393ae36a40d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/c14196e64a78570034afd0b7a9f3757ba71c2a0a",
-                "reference": "c14196e64a78570034afd0b7a9f3757ba71c2a0a",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/ef7b2f56815df854e66ceaee8ebe9393ae36a40d",
+                "reference": "ef7b2f56815df854e66ceaee8ebe9393ae36a40d",
                 "shasum": ""
             },
             "require": {
+                "ext-dom": "*",
+                "ext-xmlwriter": "*",
                 "php": "^5.6 || ^7.0",
-                "phpunit/php-file-iterator": "~1.3",
-                "phpunit/php-text-template": "~1.2",
-                "phpunit/php-token-stream": "^1.4.2",
-                "sebastian/code-unit-reverse-lookup": "~1.0",
+                "phpunit/php-file-iterator": "^1.3",
+                "phpunit/php-text-template": "^1.2",
+                "phpunit/php-token-stream": "^1.4.2 || ^2.0",
+                "sebastian/code-unit-reverse-lookup": "^1.0",
                 "sebastian/environment": "^1.3.2 || ^2.0",
-                "sebastian/version": "~1.0|~2.0"
+                "sebastian/version": "^1.0 || ^2.0"
             },
             "require-dev": {
-                "ext-xdebug": ">=2.1.4",
-                "phpunit/phpunit": "^5.4"
+                "ext-xdebug": "^2.1.4",
+                "phpunit/phpunit": "^5.7"
             },
             "suggest": {
-                "ext-dom": "*",
-                "ext-xdebug": ">=2.4.0",
-                "ext-xmlwriter": "*"
+                "ext-xdebug": "^2.5.1"
             },
             "type": "library",
             "extra": {
@@ -684,7 +684,7 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2016-12-20 15:22:42"
+            "time": "2017-04-02T07:44:40+00:00"
         },
         {
             "name": "phpunit/php-file-iterator",
@@ -731,7 +731,7 @@
                 "filesystem",
                 "iterator"
             ],
-            "time": "2016-10-03 07:40:28"
+            "time": "2016-10-03T07:40:28+00:00"
         },
         {
             "name": "phpunit/php-text-template",
@@ -772,29 +772,34 @@
             "keywords": [
                 "template"
             ],
-            "time": "2015-06-21 13:50:34"
+            "time": "2015-06-21T13:50:34+00:00"
         },
         {
             "name": "phpunit/php-timer",
-            "version": "1.0.8",
+            "version": "1.0.9",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-timer.git",
-                "reference": "38e9124049cf1a164f1e4537caf19c99bf1eb260"
+                "reference": "3dcf38ca72b158baf0bc245e9184d3fdffa9c46f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/38e9124049cf1a164f1e4537caf19c99bf1eb260",
-                "reference": "38e9124049cf1a164f1e4537caf19c99bf1eb260",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/3dcf38ca72b158baf0bc245e9184d3fdffa9c46f",
+                "reference": "3dcf38ca72b158baf0bc245e9184d3fdffa9c46f",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.3"
+                "php": "^5.3.3 || ^7.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "~4|~5"
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.0"
             },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0-dev"
+                }
+            },
             "autoload": {
                 "classmap": [
                     "src/"
@@ -816,20 +821,20 @@
             "keywords": [
                 "timer"
             ],
-            "time": "2016-05-12 18:03:57"
+            "time": "2017-02-26T11:10:40+00:00"
         },
         {
             "name": "phpunit/php-token-stream",
-            "version": "1.4.9",
+            "version": "1.4.11",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-token-stream.git",
-                "reference": "3b402f65a4cc90abf6e1104e388b896ce209631b"
+                "reference": "e03f8f67534427a787e21a385a67ec3ca6978ea7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-token-stream/zipball/3b402f65a4cc90abf6e1104e388b896ce209631b",
-                "reference": "3b402f65a4cc90abf6e1104e388b896ce209631b",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-token-stream/zipball/e03f8f67534427a787e21a385a67ec3ca6978ea7",
+                "reference": "e03f8f67534427a787e21a385a67ec3ca6978ea7",
                 "shasum": ""
             },
             "require": {
@@ -865,20 +870,20 @@
             "keywords": [
                 "tokenizer"
             ],
-            "time": "2016-11-15 14:06:22"
+            "time": "2017-02-27T10:12:30+00:00"
         },
         {
             "name": "phpunit/phpunit",
-            "version": "5.7.4",
+            "version": "5.7.19",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "af91da3f2671006ff5d0628023de3b7ac4d1ef09"
+                "reference": "69c4f49ff376af2692bad9cebd883d17ebaa98a1"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/af91da3f2671006ff5d0628023de3b7ac4d1ef09",
-                "reference": "af91da3f2671006ff5d0628023de3b7ac4d1ef09",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/69c4f49ff376af2692bad9cebd883d17ebaa98a1",
+                "reference": "69c4f49ff376af2692bad9cebd883d17ebaa98a1",
                 "shasum": ""
             },
             "require": {
@@ -890,19 +895,19 @@
                 "myclabs/deep-copy": "~1.3",
                 "php": "^5.6 || ^7.0",
                 "phpspec/prophecy": "^1.6.2",
-                "phpunit/php-code-coverage": "^4.0.3",
+                "phpunit/php-code-coverage": "^4.0.4",
                 "phpunit/php-file-iterator": "~1.4",
                 "phpunit/php-text-template": "~1.2",
                 "phpunit/php-timer": "^1.0.6",
                 "phpunit/phpunit-mock-objects": "^3.2",
-                "sebastian/comparator": "~1.2.2",
+                "sebastian/comparator": "^1.2.4",
                 "sebastian/diff": "~1.2",
                 "sebastian/environment": "^1.3.4 || ^2.0",
                 "sebastian/exporter": "~2.0",
-                "sebastian/global-state": "^1.0 || ^2.0",
+                "sebastian/global-state": "^1.1",
                 "sebastian/object-enumerator": "~2.0",
                 "sebastian/resource-operations": "~1.0",
-                "sebastian/version": "~1.0|~2.0",
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@@ -947,7 +952,7 @@
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@@ -1006,27 +1011,27 @@
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@@ -1051,20 +1056,20 @@
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+            "time": "2017-03-04T06:30:41+00:00"
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@@ -1115,7 +1120,7 @@
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@@ -1167,7 +1172,7 @@
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+            "time": "2015-12-08T07:14:41+00:00"
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@@ -1217,7 +1222,7 @@
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+            "time": "2016-11-26T07:53:53+00:00"
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@@ -1284,7 +1289,7 @@
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+            "time": "2016-11-19T08:54:04+00:00"
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@@ -1335,20 +1340,20 @@
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@@ -1381,7 +1386,7 @@
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@@ -1434,7 +1439,7 @@
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@@ -1476,7 +1481,7 @@
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@@ -1519,20 +1524,20 @@
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@@ -1574,7 +1579,7 @@
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-            "time": "2016-12-10 10:07:06"
+            "time": "2017-05-01T14:55:58+00:00"
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@@ -1624,7 +1629,7 @@
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+            "time": "2016-11-23T20:04:58+00:00"
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