Sharing overview fixes and unit tests

- Fixed renaming and fileActionsReady event
- Added unit tests for shares list
- Fixed public page with defer
- Fixed file actions in sharing overview
- Fixed sharing counterpart list (10 entries max)
- Fixed file path attribute to be used in download action
- Fix sharing list headers
- OC.Share icons now operate on fileList instance
- Fix OC.Share.updateIcon when more than one list in DOM