Refactor the addVoxel function
Refactor the addVoxel method.
And change the socket communication message when to add Voxel.
Add the argument of color to the addVoxel method
players have diff

Merge branch 'yiweili' of https://github.com/yutongp/RaiseMeUp into ypei

Conflicts:
	client/code/app/game_client.js