Board detects touch in directions
Speech bubbles now update highlight state based on which is selected
Completed sending messages to ChatInterfaceListener when channel changed
Changed to obstacles instead of tiles
Fixed Game and DebugGameListener to empty implementation
Tiles now have texture and show obstacles
Changed action opacity to 50
Added touch sensor for menu button
Added code to rotate tanks (current commented out)
Turned off the background drawing since it took too much memory
Fixed DebugGameListener to implement all necessary methods
Merged graphics_touch into master