Use reimplimented s3 form configurator.

## Main stuff (only in `direct_uploads_controller.rb`)
Swap out controller code for Aaron Baker's implementation.  This will finish out https://www.pivotaltracker.com/story/show/79863386

## Other stuff (that should be in another PR but I'm lazy so look anyway)
* Rename `bin/fs` to `bin/foreman-start` for more sensible naming.  The new name also matches the handy `bin/foreman-stop` (for killing stillborn foreman processes) and `bin/foreman-list` (for listing the stuff foreman has running) that I snuck in as part of a previous PR.
* I got rid of the solr files that are now .gitignored but were still commited.