Widget preview implementation. #114
Merge branch 'dev-content-history' of github.com:devbridge/BetterCMS into dev-content-history
Widget history logic implementation. Closes #114.
Merge branch 'dev-content-history' of github.com:devbridge/BetterCMS into dev-content-history

Conflicts:
	Sandbox/BetterCms.Sandbox.Mvc4/file/bcms-pages/scripts/bcms.pages.widgets.js