KhronosGroup/glTF#23 - Respected Collada's unit element and scaling models accordingly.
Upgraded OpenCOLLADA to latest version.
Fixed an auto formatting error.
KhronosGroup/glTF#23 - Fixed scaling of matrices.
Fixed camera's zfar and znear properties that now respect the file's meter attribute.
Added distanceScale property to the GLTFAsset so we don't have to pass it around.
Small fix when exporting matrix.
Merged dev-7
Fixed scaling issue for meshes with multiple primitives.
Merge pull request #285 from tfili/scale-to-meters2

#23 - Scales gltf file to meters
Merged in dev-7