Made the old embedder work

Added a page to test it (media/test/old-embedder/)

Fixed syntax errors in unisubs-widget.css.  Updated embed.js template
to use the new template tags.  Implemented the url_for template tag

Fixed exception in widget.rpc.  Just hardcode embed_version='', which
was controled by the settings file before.  I have no clue what that
is for.
Added setting to not compress static media.

Added a test for it and also fixed some other unittests along the way.

Added an empty models.py module to avoid django errors.
Made the embedder work with HTTPS

Added a page to test the embedder (/media/test/embedder/)

Added a static_url() template tag.

Fixed our embedder JS so that it uses the same protocol as the request
for URLs instead of forcing HTTP.  For most URLs this simply meant
changing "http://" to "//" (AKA a protocol-relative URL).  For some
reason this didn't work for iframeDomain, but the fix was simple
enough there, just use parser.protocol.