export_cal3d - exporting all actions (option) wasnt working

export_fbx - blender cameras now work properly (converted lens angle, rotate to the right axis)
	Made meshes, armatures and cameras use the same namespace.
DirectX8Exporter - update from David Teviotdale, change names of exported objects so some DX readers dont fail
xsi_export - Null materials made the export fail (python error).
	This may not be a correct solution since material indicies could be messed up now. I have no way of reading these files.

release/scripts/xsi_export.py

@@ -171,7 +171,10 @@ def get_materials(obj):
   mats.extend(obj.getData(mesh=1).materials)
 
   # return the materials list
-  return mats
+  
+  # Is this correct!!?? - None materials raise an error otherwise
+  # but it might screw up the indicies.. TODO... check the exported files.
+  return [m for m in mats if m] 
 
 # ---------------------------------------------------------------------------
 # do_header writes out the header data