- more work on materials , metadata etc : not yet fully working
 * updated specs
- a bit of cleanup of old unused code
- started refactoring for more readability/ reuse:
 * moved coordinates (coords, normals) and colors parsing back to parseVector3 & parseColor
 * added createObject method to generate final object instances
 * removed additional clutter code
- fixed issues with normals parsing / prefix in parseVector3
- updated browserDemo/test
- further cleanup and minor fixes