feat(media): improve ui
fix(users) : hide hints when inserting new user

Remove hints for "required" fields when creating new user, and instead
of hints, show asteriks
fix(users): hide required fields on user preview

Show "required" field only when it is required, not always
feat(users): add user list sorting

+ change sd-sort directive
+ add sd-sort directive to user list

SD-242
fix(tests): add missing filter into spec
fix(media): get media upload url via api
fix(intent): close modal on route change
fix(media): make select btn work with hidden input
fix(bower): set new moment version compatible with moment-timezone
feat(upload): initial cancel upload implementation
fix(media): use real api for listing

SD-232
feat(upload): implement metadata saving via upload modal

SD-231
fix(media): media popup style fix
fix(media): move inline meta fields to directive
fix(upload): make it edit HeadLine not description

SD-231