Build: Replace grunt-clean with rimraf
Build: Remove unused tasks
Build: Remove dates from copyright notice
README: Cleanup
Build: Remove manifest task

This task hasn't been used since 1.11.0 was released.
Build: Upgrade to Grunt 0.4.5

* Upgrade to grunt-check-modules 0.2.0
* Upgrade to grunt-jquery-content 1.0.0
Build: package.json cleanup
1.11.8
Build: Upgrade to grunt-jquery-content 2.0.0