Moved custom navigation bar code to a separate method in the login view controller.
Standardized the behavior of hiding the table view separators until we're ready to load data into the table across the friend and service pickers.
Cached services should still be alphabatized.
Converted the service picker to use the service methods to display the login view controller.
Moved access token retrieval to SinglySession and simplified the login view controller.
Removed deprecated usage of dismissModalViewControllerAnimated.