* add course and org to full/course.xml
* fix error path in clean_xml script
* commit rakefile change needed by c5334f150c

* add fix for the file export code--remove tag tail and text,
  not just the children.

* uses xml modulestore, and new error_handler hook

Acknowledge the fact that right now keystore is really just a module store. If we need a keystore that returns other objects, we can reexctract the base class into it's own module again

TODO:
  - support picking a different course name
  - make it use current module rendering path, get that working.