Merge pull request #8 from szymonkaliski/master

remove unnecessary uniforms redefinition as var in materials
Switched to dumb code in ObjReader because 
coffee lint switched "if a = match" to "if a == match"
Added texCoords and Normals to ObjWriter
Added HSV builder function to Color
Updated pex build
Merge branch 'master' of github.com:vorg/pex