Final Commit for all HWs

(1). The Abalone Can finally player in both emulator and container
    correctly.
(2). AI: it just selects random legal moves every time, with maximum
    time 1 second.
(3). Fix the letency in animation, which is caused by not clearing board
    each time.
(4). Final game test URL:
    http://7-dot-abalone-game-smg.appspot.com/AbaloneGame.html
    (4.1). Emulator URL:
    http://smg-gwt-emulator.appspot.com/GwtEmulator.html
(5). Readme updated.