Updates to armature export
Merge remote-tracking branch 'neomonkeus/feature/export_armature' into
feature/export_armature

Conflicts:
	io_scene_nif/nif_export.py
Multiple changes to import/export functions, decompose_srt is more
precise and scale_correction now functions the same as blender scale
function.
Fix for Sub Issue : # 16: Incorrect encoding of bone names.