* master: (27 commits)
Make uploading previewing less unique. Close #745.
On #752, updating the hash structure to be dict-style for easy name lookup and insert
Basic concerpt for #752
Updated frontend to work with the new views.
Adding timezone and locale to allowed user params closes #754
Frontend passes preview=true along will all ajax requests. Close #441.
Clean up minor frontend lint warnings.
Switch to ScreenOptions to setup a screen with options.
Made some changes to icon presentations for content browse
Screen auth: allow HTTP Basic using CORS login
Restricted deletion of users and spruced up user management view
...and the return
Made delete restrictions for groups and templates consistent
fixes concerto-debian #46
Added disabled class and tooltip to Delete Group button to close #747
Prevent deletion of a group owning feeds or screens per #747
allow authenticated users to create Media for #745
Redeveloped groups#show for #734; moved member management to its own view; updated tests
Bump to 0.8.1.julietjaguar.