(1)use the strategies of robot-3 in myrobot to progress our firepower. (2)edit the hp loss rate from (HP-=3) to (HP-=1) in order to add interest of the game (3)add two more robots of level robot-3 in index.html.
Merge pull request #1 from TimingJL/master

progress the firepower of myrobot by using the strategies of robot-3