Visual improvements and Bug fixes.

Implemented a sort of 'Dispatch' activity that determines whether the user is logged in or not and directs them to the Login activity or the Main activity. This activity is headless and completely invisible to the user.
 - This fixes a bug where if you press the 'Back' button on the main screen it goes back to the login activity. 

Visual Updates:
- Increased some of the padding and spacing throughout the app to align it more with the Material Design Specs.
- Fixed the Navigation Drawer that it will now draw behind the status bar on Lollipop+ (as per http://www.google.com/design/spec/patterns/navigation-drawer.html) 
- Increased the size of the plus icon in the FAB to proper spec (24dp) 

Cleaned up the build.gradle files a bit to consolidate the Fabric imports.

See merge request !1

Fix for issue #23

Modified the POST requests to account for security issue stated in [issue #23](https://gitlab.com/Commit451/GitLabAndroid/issues/23).

See merge request !2

 - Modified several margins and padding to comply more with the Material Design Spec
 - Fixed the navigation drawer to render under the status bar

-Changed to gradle dependency for Bypass
-Moved global state into app
-Use event bus for state related things
-Add about screen
-Add Fabric for tracking crashes
-Update to new build tools and Android 23

Switch to normal progress loading indicator on login and main activity. Also, use a consistent image size instead of computing the size in a weird way.

Pass things as parcelable instead of just holding static references. Use progress indicator in a few places instead of a progress dialog. Remove "..." on every string.

Adapters now update via events posted on the event bus, instead of holding static references to adapters