Keep last updated time from main view to category view
Added manual refresh error message and status bar update for category list.

Updated status bar anytime viewwillappear is called
Ignore if toolbar is present.  Only pay attention when alerting user to error when in category list view.
Added refresh capabilities to grid and list views in main and category.

Combined category list and grid load more stories into iPadCategoryViewController

Added failed popover on search fail

Changed some NSOperationQueue mainQueue addOperationWithBlock to dispatch_async main_queue