[Android] [URBNG-274] Add logout functionality
Changed that "Logout" menu item is not visible if user is not logged.
Merge branch 'android' of github.com:lucdom/UrbanGame into android_URBNG-360

Conflicts:
	UrbanGame/AndroidManifest.xml
	UrbanGame/src/com/blstream/urbangame/LoggingInActivity.java
	UrbanGame/src/com/blstream/urbangame/MainActivity.java
[URBNG-360] Added GsonTaskAdapter class to commit
[URBNG-360] Made suggested changes
[URBNG-333][Android] Update database to include comments[changes] for
task
Ready to go. 

[There's additional small patch for task status, which I forgot to write
previously. In past I have added status constant and somehow forgot
about status field. Patch is very small, so I'm sending it together with
this task.]
Merge pull request #62 from herbatnik/android

[URBNG-333][Android] Update database to include comments[changes] for
join/leave functionality
Merge remote-tracking branch 'remotes/blstream.origin/android' into android_URBNG-360
[URBNG-360] Added enum and default case statements.
URBNG-54 [Android] Join/leave the game URBNG-268
[Android] Add join/leave functionality to buttons

Ready Join Leave Functionality. [It requires Kamil's login/register
related classes
small testing line removal
Merge pull request #60 from lucdom/android

[Android] [URBNG-360]
Merged with URBNG-277: [Android] GameTasksFragment
Merged with [Android] Completed URBNG-357, URBNG-358, URBNG-359 from URBNG-55
Merged with [Android] Completed URBNG-357, URBNG-358, URBNG-359 from URBNG-55
Merged with URBNG-268 [Android] Add join/leave functionality to buttons
merged upstream/android