Conflicts:
	src/renderers/WebGLRenderer.js

OBJLoader: made scientific notation regexes case-insensitive

improve compressed texture availability check

PVRloader - support v2 and v3 format

  - convert available format to real Array
  - test if texture glFormat is found in supported formats

note : the test against supported format before upload log an explicit warning but can't prevent gl warnings during draw call (texture is invalid)

Colladaloader kinematics

PVRTC support in examples

  - Split DDSParser, put common parsing process in abstract CompressedTextureLoader
  - added PVRLoader based on CompressedTextureLoader
  - added feature detection and PVRTC related gl contants in Three / WebglRenderer
  - added a sample page

Typo in GridHelper docs