Pages: Use JSON instead of YAML for metadata
Build: Upgrade to Grunt 0.4.5

* Upgrade to grunt-check-modules 0.2.0
* Upgrade to grunt-jquery-content 1.0.0
* Replace grunt-clean with rimraf
* Remove grunt-html
* Remove unused tasks
Build: Remove dates from copyright notice
Build: package.json cleanup
1.1.0
Build: Upgrade to grunt-jquery-content 2.0.0