new features - import object and single out mesh

It is now possible to import a babylon object (using a babylon file) to
edit its materials.
It is also possible to single out a specific mesh that was selected in
the select box.
Various bug fixes were added as well.
Bug fixing

now rounding the color to always get a correct color
Bug fixing - init material

While initializing object with material, the material would have been
deleted. fixed.