- ops view for the desktop app to talk to
  - xmodule that talks to the foldit model and displays the student's state
  - grading tweak to make grade updates from an external service work:
    - Add an always_recalculate_grades property to XModuleDescriptor.

first pass at static tab editing. Doesn't yet support drag/drop as well as new tab creation, which needs to modify the policy on the course

implement static tabs. rejigger .tar.gz import to do the re-namespacing as a post-processing step as we need to retain the original url_name during the import. Also, migrate the presentation tier to use module_render.py::get_module() to better unify HTML'ifying stuff

- Piotr requested this.  Hopefully it doesn't break anything, but we should run it by the content fellows before merging.

* change references and tests
* add staff/non-staff display
* added is_staff to ModuleSystem

* Also get rid of lazy loading of metadata and definition

The basic form has been fleshed out. Things still to do:
1) Extend get_course interface to the rest of modulestore
2) Make courses actually load
3) Make org/course/maybe others metadata attributes for course_module (see xml_module), so
that they are loaded/saved on import/export to xml