This allows us to a) compile the coffeescript and sass from xmodules
using the new out-of-band method and b) reload xmodule static content
whenever it changes, which should make devs much happier.

  - 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.

This reverts commit c4f56620.

This reverts commit ab437b94, reversing
changes made to 7a8e87c7.

Also, allow for the hiding of the Prompt and the Rubric.