Merges branch 'release/0.5.1' into develop
Adds WP-Requirements Dependency.
Adds Autoloading to the ArrowLoader.

* Major Refactoring of the ArrowPluginLoader.
* ArrowPluginBootstrap now handles the bootstrapping sequence.
Merges branch 'feature/add-auto-plugin-load' into develop
Scrutinizer Pass 1
Bumps version to 0.6.0
Updates changelog for 0.6.0
Merges branch 'release/0.6.0'