diff --git a/.travis.yml b/.travis.yml
index 9dd1ee89..a27b8e32 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,6 @@
 language: php
 
 php:
-  - 5.3
   - 5.4
   - 5.5
   - 5.6
@@ -13,10 +12,9 @@ install:
 
 script:
   - find ./src -name "*.php" -print0 | xargs -0 -n1 -P8 php -l
-  - phpunit
+  - vendor/bin/phpunit
   - vendor/bin/phpspec run -f pretty --no-interaction
-  # Don't test coding on php 5.3.
-  - test ${TRAVIS_PHP_VERSION} == "5.3" || ./vendor/bin/phpcs --standard=./phpcs-ruleset.xml --ignore=./vendor --ignore=./doc --ignore=./spec --ignore=./drush .
+  - ./vendor/bin/phpcs --standard=./phpcs-ruleset.xml .
 
 # Enable Travis containers.
 sudo: false
diff --git a/README.md b/README.md
index 5116aa13..2dfc27cc 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,9 @@
+<?php
+
+/**
+ * @file
+ */
+?>
 [![Build Status](https://travis-ci.org/jhedstrom/DrupalDriver.svg?branch=master)](https://travis-ci.org/jhedstrom/DrupalDriver)
 
 Provides a collection of light-weight drivers with a common interface for interacting with [Drupal](http://drupal.org). These are generally intended for testing, and are not meant to be API-complete.
@@ -35,7 +41,6 @@ $> php composer.phar install
 <?php
 
 use Drupal\Driver\DrupalDriver;
-use Drupal\Driver\Cores\Drupal8;
 
 require 'vendor/autoload.php';
 
diff --git a/phpcs-ruleset.xml b/phpcs-ruleset.xml
index 7f07a3f6..8087c9e5 100644
--- a/phpcs-ruleset.xml
+++ b/phpcs-ruleset.xml
@@ -12,4 +12,10 @@
         <exclude-pattern>src/Drupal/Driver/Cores/*.php</exclude-pattern>
     </rule>
 
+    <exclude-pattern>*/doc/*</exclude-pattern>
+    <exclude-pattern >*/drush/*</exclude-pattern>
+    <exclude-pattern>*/spec/*</exclude-pattern>
+    <exclude-pattern>*/vendor/*</exclude-pattern>
+    <exclude-pattern>*/README.md</exclude-pattern>
+
 </ruleset>
diff --git a/src/Drupal/Driver/Cores/AbstractCore.php b/src/Drupal/Driver/Cores/AbstractCore.php
index 02654184..7de69196 100644
--- a/src/Drupal/Driver/Cores/AbstractCore.php
+++ b/src/Drupal/Driver/Cores/AbstractCore.php
@@ -69,6 +69,8 @@ public function getFieldHandler($entity, $entity_type, $field_name) {
   /**
    * Expands properties on the given entity object to the expected structure.
    *
+   * @param string $entity_type
+   *   The entity type ID.
    * @param \stdClass $entity
    *   Entity object.
    */
diff --git a/src/Drupal/Driver/Cores/CoreInterface.php b/src/Drupal/Driver/Cores/CoreInterface.php
index 7c786582..bb5b124c 100644
--- a/src/Drupal/Driver/Cores/CoreInterface.php
+++ b/src/Drupal/Driver/Cores/CoreInterface.php
@@ -134,6 +134,8 @@ public function roleDelete($role_name);
   /**
    * Get FieldHandler class.
    *
+   * @param object $entity
+   *   The entity object.
    * @param string $entity_type
    *   Entity type machine name.
    * @param string $field_name
diff --git a/src/Drupal/Driver/Cores/Drupal6.php b/src/Drupal/Driver/Cores/Drupal6.php
index f004bae5..d07c4657 100644
--- a/src/Drupal/Driver/Cores/Drupal6.php
+++ b/src/Drupal/Driver/Cores/Drupal6.php
@@ -268,7 +268,7 @@ public function validateDrupalSite() {
 
     $_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] = $_SERVER['PHP_SELF'];
     $_SERVER['REMOTE_ADDR'] = '127.0.0.1';
-    $_SERVER['REQUEST_METHOD']  = NULL;
+    $_SERVER['REQUEST_METHOD'] = NULL;
 
     $_SERVER['SERVER_SOFTWARE'] = NULL;
     $_SERVER['HTTP_USER_AGENT'] = NULL;
@@ -316,7 +316,7 @@ protected function expandEntityProperties(\stdClass $entity) {
    * @return array
    *   An array of vocabulary objects
    */
-  protected function taxonomyVocabularyLoadMultiple($vids = array()) {
+  protected function taxonomyVocabularyLoadMultiple(array $vids = array()) {
     $vocabularies = taxonomy_get_vocabularies();
     if ($vids) {
       return array_intersect_key($vocabularies, array_flip($vids));
@@ -429,13 +429,6 @@ public function getExtensionPathList() {
     return $paths;
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  protected function expandEntityFields($entity_type, \stdClass $entity) {
-    return parent::expandEntityFields($entity_type, $entity);
-  }
-
   /**
    * {@inheritdoc}
    */
diff --git a/src/Drupal/Driver/Cores/Drupal7.php b/src/Drupal/Driver/Cores/Drupal7.php
index 3aa402c1..ac3050a3 100644
--- a/src/Drupal/Driver/Cores/Drupal7.php
+++ b/src/Drupal/Driver/Cores/Drupal7.php
@@ -238,7 +238,7 @@ public function validateDrupalSite() {
 
     $_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] = $_SERVER['PHP_SELF'];
     $_SERVER['REMOTE_ADDR'] = '127.0.0.1';
-    $_SERVER['REQUEST_METHOD']  = NULL;
+    $_SERVER['REQUEST_METHOD'] = NULL;
 
     $_SERVER['SERVER_SOFTWARE'] = NULL;
     $_SERVER['HTTP_USER_AGENT'] = NULL;
diff --git a/src/Drupal/Driver/Cores/Drupal8.php b/src/Drupal/Driver/Cores/Drupal8.php
index c1cd9ab0..6e667297 100644
--- a/src/Drupal/Driver/Cores/Drupal8.php
+++ b/src/Drupal/Driver/Cores/Drupal8.php
@@ -291,7 +291,7 @@ public function validateDrupalSite() {
 
     $_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] = $_SERVER['PHP_SELF'];
     $_SERVER['REMOTE_ADDR'] = '127.0.0.1';
-    $_SERVER['REQUEST_METHOD']  = NULL;
+    $_SERVER['REQUEST_METHOD'] = NULL;
 
     $_SERVER['SERVER_SOFTWARE'] = NULL;
     $_SERVER['HTTP_USER_AGENT'] = NULL;
diff --git a/src/Drupal/Driver/DrushDriver.php b/src/Drupal/Driver/DrushDriver.php
index a51ec519..b2e1b1ae 100644
--- a/src/Drupal/Driver/DrushDriver.php
+++ b/src/Drupal/Driver/DrushDriver.php
@@ -36,6 +36,8 @@ class DrushDriver extends BaseDriver {
 
   /**
    * Track bootstrapping.
+   *
+   * @var bool
    */
   private $bootstrapped = FALSE;
 
@@ -196,6 +198,7 @@ public function clearStaticCaches() {
    *
    * @param string $output
    *   The output from Drush.
+   *
    * @return object
    *   The decoded JSON object.
    */
@@ -247,7 +250,11 @@ public function isField($entity_type, $field_name) {
     // Drush Driver to work with certain built-in Drush capabilities (e.g.
     // creating users) even if the Behat Drush Endpoint is not available.
     try {
-      $result = $this->drush('behat', array('is-field', escapeshellarg(json_encode(array($entity_type, $field_name)))), array());
+      $arguments = array(
+        'is-field',
+        escapeshellarg(json_encode(array($entity_type, $field_name))),
+      );
+      $result = $this->drush('behat', $arguments, array());
       return strpos($result, "true\n") !== FALSE;
     }
     catch (\Exception $e) {
diff --git a/src/Drupal/Driver/Exception/Exception.php b/src/Drupal/Driver/Exception/Exception.php
index b8b76a87..67b5cc84 100644
--- a/src/Drupal/Driver/Exception/Exception.php
+++ b/src/Drupal/Driver/Exception/Exception.php
@@ -15,7 +15,7 @@ abstract class Exception extends \Exception {
    *
    * @param string $message
    *   The exception message.
-   * @param DriverInterface $driver
+   * @param \Drupal\Driver\DriverInterface $driver
    *   The driver where the exception occurred.
    * @param int $code
    *   Optional exception code. Defaults to 0.
diff --git a/src/Drupal/Driver/Exception/UnsupportedDriverActionException.php b/src/Drupal/Driver/Exception/UnsupportedDriverActionException.php
index 7e2ce40d..9fac49b4 100644
--- a/src/Drupal/Driver/Exception/UnsupportedDriverActionException.php
+++ b/src/Drupal/Driver/Exception/UnsupportedDriverActionException.php
@@ -14,7 +14,7 @@ class UnsupportedDriverActionException extends Exception {
    *
    * @param string $template
    *   What is unsupported?
-   * @param DriverInterface $driver
+   * @param \Drupal\Driver\DriverInterface $driver
    *   Driver instance.
    * @param int $code
    *   The exception code.