Robot can now determine where red balls are.

- Added a world model in /robot/src/model/RobotWorld.java,
  with data structures for balls and for walls.
- Added a brain for the robot, which constructs RobotWorld
  from the data extracted via the RobotEye.
- No position or angle control yet, because Maple API is
  still unclear.
- Green ball detection requires parameter tuning, and wall
  detection requires synthesis of detected lines by the
  RobotWorld.
Merge branch 'master' of http://github.com/maslab-team/maslab-2014-team17