Drag/drop UI for document type properties and tabs
Fixed issue where dropped properties not saving when dropped on a tab inherited from a parent document type
Localised no properties message
Fixed issue with re-ordering on a single tab
Styling of drop zone for draggable document type properties
Merge branch 'wip-dragdrop2' of https://github.com/AndyButland/Umbraco-CMS into AndyButland-wip-dragdrop2