This reverts commit 2894b21c, reversing
changes made to 34d0fe15.

Now all Video tags and VideoAlpha tags will be handled by VideoAlpha.

Conflicts:
	common/static/coffee/src/logger.coffee

Conflicts:
	common/static/coffee/src/logger.coffee

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.

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