clarify non-shared message, also add for shared via calendar
fix share dropdown being hidden and hiding calendar which will be shared
remove confusing note, instead only make it possible to edit calendar sharing in the calendar sharing settings
only append (group) indicator to groups, no need to put (user) after every user
improve look of sharing tab
remove 'can delete' permission, also resolve CSS 'delete' class conflict
Merge pull request #218 from owncloud/more-calendar-fixes

More calendar fixes