Reorganized UI groups as part of iOS 7 UI work
Merge branch 'development' into feature/ios-7-ui

Merge fixes for Loopy integ
Initial commit of Navigation Bar class clusters, with specific impl for Share dialog (a subclass of SZNavCtrlr)
Merge branch 'development' into feature/ios-7-ui
Commit of all Nav controllers with clusters
edgesForExtendedLayout on views with new nav bar
Removed redundant iOS 7 variants for navbars (layout for these is an app-wide configuration) and completed navbar conversion for all known screens
Used standard ShareThis green color for navbar
Initial commit of UIButton iOS 6 class cluster
Renamed iOS 6 button to reflect category
Incremental commit with some button candy
Made some constants for sizing
Added iOS 7 back button
Back button fixes
Changed Comment List header icon to ShareThis (from Socialize)
Incremental commit of CommentsTableView for iOS 7
Pixel polishing for CommentTableView
iOS7 look & feel for CommentsTableViewFooter
iOS 7 L&F for Comment details table
Fixes based on tests