Fix reference that should be weak.
Added SFMessage error messages to bills.
Use TSMessage error instead of UIAlertView. Override defaultViewController so [TSMessage showInternetError] works.
Changed various SF*Service classes to return an empty array for 0 results versus nil in case of an error. Refactored various viewcontrollers to handle the empty array and nil appropriately. SFMessage improvements so we can display some messages when there are errors fetching data.