Fixes invalid version heading
Bumps wordpress version to 4.0
Temporary Fix for Readme Validator.

* Response format from the wordpress.org readme validator may have changed, TODO: Investigate.
Upgrades phpdocumentor to v2.7.0
Merges branch 'feature/upgrade-to-wordpress-4-0' into develop
Updates changelog
Bumps version to 0.2.2
Updates changelog form 0.2.2.
Build 0.2.2
Merge branch 'release/0.2.2' into develop