Fixed: last post display in group list
Fixed: group edit cases (add member menu item; always add self to new
group; handle remove-self-from-group)
Added TODO comment for resigning group UI
Fixed: explicitly update adapters in views when resuming (event handlers
are only invoked when the views are in the foreground)
Sort group and friend lists
Menu item label changes
Fixed: consistent keyboard styles for data entry views
Fixed: expanding member list obscured Save button