Internet Explorer fix for UI.Number and UI.Integer slider.

Implemented similar fix to TransformControls using previous and current
pointer positions.
replaced use of xpath queries with querySelectorAll to fix missing xpath in IE11
Face vertex normals and face vertex UVs must not be shared. Fixed.
Merge branch 'UI-Number-and-Integer-IE-Patch' of https://github.com/gwindes/three.js into dev
ui.js: code clean up.
Updated builds.
Merge branch 'dev' of https://github.com/Bjvanminnen/three.js into dev
Merge branch 'ie11-collada' of https://github.com/MSOpenTech/three.js into dev
ColladaLoader: Code clean up.
- Background node color and angle parsing complete
Moved Sprite.rotation to SpriteMaterial.rotation.
Updated builds.
SpriteMaterial.useScreenCoordinates false by default.
Considering removing the property altogether actually...
Updated builds.
More work on unifying CanvasRenderer Sprites with WebGLRenderer Sprites.
Not entirely correct yet.
Updated builds.
Document THREE.js constants