Flesh out the Group activity. Get the projects for the group and add clear button to Search activity

Fix the rest of the places where we use swipe refresh layout and also fix overview fragment from not loading data on first launch.

Update Timber to 4.0.1

Update dependency and fix StringFormatInTimber and BinaryOperationInTimber lint warnings.

See merge request !3

Change app navigation and structure to where you load projects as needed and initially are presented with a project picker. WIP, but I want to commit since this is going to touch so many areas.

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