Add WP Coding Standards as a dependency

Previously WPCS had to be installed as some global
thing, now you can just run `composer install` and
use

    $ vendor/bin/phpcs ./

to run PHPCS checks on the codebase.

Author: rask

composer.json

@@ -12,5 +12,9 @@
   ],
   "require": {
     "php": ">=5.3.0"
+  },
+  "require-dev": {
+    "dealerdirect/phpcodesniffer-composer-installer": "^0.4.4",
+    "wp-coding-standards/wpcs": "0.12.0"
   }
 }

composer.lock

@@ -2,11 +2,15 @@
 <ruleset name="anttiviljami-wordpress">
   <description>For nicer WordPress and PHP development</description>
 
-  <!-- Don't check composer dependencies -->
-  <exclude-pattern>/vendor/</exclude-pattern>
-
-  <!-- Exclude language files -->
-  <exclude-pattern>/lang/</exclude-pattern>
+  <!-- Files and directories to parse -->
+  <file>./classes/</file>
+  <file>./inc/</file>
+  <file>./wp-libre-form.php</file>
+
+  <!-- Excluded directories and files -->
+  <exclude-pattern>*/vendor/*</exclude-pattern>
+  <exclude-pattern>*/lang/*</exclude-pattern>
+  <exclude-pattern>*/assets/*</exclude-pattern>
 
   <!-- Disallow tabs altogether -->
   <rule ref="Generic.WhiteSpace.DisallowTabIndent.TabsUsed"/>