Update WebGLRenderer.js
Update Sprite.html
Update SkinnedMesh.html
Update ParticleSystem.html
WebGLRenderer: Modify to take in existing WebGL context

This patch modifies WebGLRenderer to take in an existing WebGL context, and adds an unit test to test the behaviour.

Signed-off-by: Prabindh Sundareson <prabindh@yahoo.com>
Update Texture.html
Update Texture.html
Merge branch 'patch-9' of https://github.com/gero3/three.js into dev
Merge branch 'patch-10' of https://github.com/gero3/three.js into dev
Merge branch 'patch-13' of https://github.com/gero3/three.js into dev
Merge branch 'dev' of https://github.com/prabindh/three.js into dev
WebGLRenderer: Renamed givenGLContext parameter to context.
Merge branch 'patch-14' of https://github.com/gero3/three.js into dev
Merge branch 'patch-12' of https://github.com/gero3/three.js into dev