Blender Git Loki

Fixes
* material indicies were incorrectly exported
* export object materials using colbits
* scaled armatures would scale bones twice
* scenes with no world would raise an error

Additions
* added options for global scaling and rotating, defaults will load correctly in MotionBuilder
* modifiers can be applied to skinned meshes, the armatures are set to their rest positions for python to get the un-deformed mesh. This makes exporting a mesh with subsurf and armature applied work as expected.
* meshes with parent bones are exported as weighted meshes.
* use lamp modes for cast light and cast shadow FBX settings.
* batch exporter, scenes or groups can be exporter to a file each.
* help button to load the wiki exporter page.