Updated worldIndex and added function setWorldMap()
small change
Merge branch 'xinbweng' of https://github.com/yutongp/RaiseMeUp into ypei
Unabled adding a box to an occupied cell
Unenabled adding voxel when blockLeft <=0
Merge branch 'yifei' of https://github.com/yutongp/RaiseMeUp into ypei
Merge branch 'xinbweng' of https://github.com/yutongp/RaiseMeUp into ypei
ball can move !!!!
add more features
Added freezing period before water flows, changed movingPlane color
add water
fix bug with move
Merge branch 'yiweili' of https://github.com/yutongp/RaiseMeUp into ypei

Conflicts:
	client/code/app/game_client.js
Merge branch 'xinbweng' of https://github.com/yutongp/RaiseMeUp into ypei

Conflicts:
	client/code/app/game_client.js
Merge branch 'lucas' of https://github.com/yutongp/RaiseMeUp into ypei

Conflicts:
	client/code/app/game_client.js
remove water depth buffer
Merge branch 'ypei' of https://github.com/yutongp/RaiseMeUp into yiweili
fix merge problem
Merge branch 'ypei' of https://github.com/yutongp/RaiseMeUp into yiweili
bug free