parameterize gridCellSize and gridCellNumber
the default grid is of 10*10 cells with cell size 100
add id  'game board' to container and also id 'grid'
Merge branch 'yiweili' of https://github.com/yutongp/RaiseMeUp into ypei
Added sign-in popup window and jquery.lightbox_me lib.
remove top threejs info
Merge branch 'xinbweng' of https://github.com/yutongp/RaiseMeUp into ypei
Fetch playerName and roomNumber
random cube color for player
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
add room control in server and add channel communication
players have diff

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

Conflicts:
	client/code/app/game_client.js
Merge branch 'yifei' of https://github.com/yutongp/RaiseMeUp into ypei
merge with yifei
bug fixed