Added sf- prefix to all selectors attributes
Merge branch 'development' of https://github.com/Sitefinity/feather-widgets into SelectorsRefactoring

Conflicts:
	DynamicContent/Mvc/Views/DynamicContent/DesignerView.Simple.cshtml
Merge branch 'development' of https://github.com/Sitefinity/feather-widgets into SelectorsRefactoring

Conflicts:
	DynamicContent/Mvc/Views/DynamicContent/DesignerView.Simple.cshtml