Login Bug + Logout Added + Code Reformat

-The bug which allowed users to press back after logging in has been
fixed. See the "setFlags" code when you want to clear a task like that.

-Added a menu to MainLobbyActivity so users can now log out. When you
make a change to ParseUser like logging out, to start an activity to
DispatchActivity. Also make sure to use the code discussed on first
bullet so users can't press back

-Code reformatted on all pages to use TABS instead of SPACES (: