List to do: 1 no check game over 2 no check if the specific moving is don't trigger shift and merge, so don't add random number 3 random add number not optimize 4 any moving need to check if it trigger shift() and merge()
List to do:
1 no check game over
2 no check if the specific moving is don't trigger shift and merge, so don't add random number
3 random add number not optimize
4 any moving need to check if it trigger shift() and merge()

List done:
1 v1.0 version is finished, there are some bugs need to fix

qzTW/2048