refactor settings controller

- temp disconnect login
- remove navigation controller
- layout content as menu items in table
- add a stock blurred bg
- hack together some transparency on cell via an embedded view
wire up transitions for settings' menu items w/ swreveal controller

- login (reconnects) to the login controller that was being used before
- profile defaults back to feed view
add another placeholder menu item that goes back to feed view
wire up login on updated settings controller

- LoginViewController concerns now handled by SettingsViewController so
they're deleted.
- cellForRowAtIndexPath sets text for "Login" or "Logout" for the
  appropriate prototype cell's title based on [PFUser currentUser]
expression
- didSelectRowAtIndexPath call the instance method, didSelectLoginCell
- didSelectLoginCell logs out the current user if there is one,
  otherwise goes into the  Parse login / signup controller flow
resize face icon in settings controller
login Dfault user before saving to prevent crash
double dismiss view controller on save success, to get back to feed view controller
Merge pull request #34 from maml/refactor-login-flow

Refactor login flow