change the image of zombie;add the princess;update the princess image and move;change the data structure of Assets
craete magic class;give the princess two magics,subclass of magic, fire and hurricane;change the time of princess show up; add new soccer, roundSoccer and add its behavior.
fix few bugs
add a new bomb soccer, change the bounds of object; delete the releax of bounds
simplify the code, fix some bugs, change the bounds jugement