Finish the BasicFileStore storage system, with full tests of
course, to match the full interface description in storage.py.

At the time of writing most of this is done, but I need to finish
it.

Make basic image submission process work.

This is actually a multi-step ticket but I think it's appropriate
to lay it out in one.

Basically have views to guide the user through submitting an image
and registering it for conversion. Then convert it w/ the
celery/whatever conversion system we have yet to write, then have
it actually be available as something to view on a basic page.

This ticket doesn't cover the "final" adjustments of what
displaying an image will look like, it just needs to make this
possible and viewable from start to finish.

Write up a good press release for the MediaGoblin blog for the
official "announcement" day of April 30th. We shouldn't publish it
live till April 30th though.