add the player model and the movePlayer() function.
Merge branch 'yiweili' of https://github.com/yutongp/RaiseMeUp into ypei

Conflicts:
	client/code/app/game_client.js
sync blocks in server; move ball with key
Merge branch 'xinbweng' of https://github.com/yutongp/RaiseMeUp into ypei

Conflicts:
	client/code/app/game_client.js
Added worldMap 3D array