fix of my failure with git
Merge branch 'master' of https://github.com/jester-ilia-night/WebglQuadtree

Conflicts:
	js/Cube.js
	js/Ground.js
	js/main.js
add mouse position
Merge branch 'master' into gh-pages

Conflicts:
	js/Cross.js
	js/Ground.js
	js/main.js