Fight Fleet Android Client - Game Graphics

This pull request includes the following improvements:

+ Graphical representation of the game board
+ Click/tap on screen to pick a location to strike
+ Automatic updating of the game board by polling the server for updated game state
+ Game ID has been added to the list of games (makes it easier to distinguish between similar looking games...)
+ Proof of concept for always highlighting latest move (needs changes on the server side for proper implementation)

For more information please see Google Groups thread:
https://groups.google.com/forum/?fromgroups=#!topic/fight-fleet/vI3ieyHqjiE