Cleanup: Removed Unused Files

Remove the elvis/static/ directory. These files were used (at one point) for
testing the database locally. Now they're unused, and moreover they aren't
static files related to the app itself.
Cleanup: Remove Old Media Files

These files were used (last summer) during database development and testing. We
may indeed choose to keep them on the deployment server, but they're
deployment-dependent data, and they're currently unused, so we shouldn't keep
them in the repository. We'll come back to fetch them later.
Fixed: Add elvis/elvis/media/ to .gitignore (with .gitkeep)

In the previous commit, I removed all the files in this directory. This will be
the MEDIA_ROOT when PRODUCTION is False, so I want the directory to exist (thus
the addition of .gitkeep), but I don't want to commit anything that appears in
there (thus the inclusion in .gitignore).