This allows us to deploy much faster: all we have to do is to copy the
assets from the container to the shared volume.
We also changed the way themes are managed: similarly to static assets,
they are now packaged inside the docker image.
By default, open response assessment files are sent to S3. Here, we
store uploaded files with the "filesystem" backend instead. To do so, we
must install a forked version of ora2 that fixes a couple issues.
Note that the "django" backend is not very usable, as file extensions
are lost on upload.
Close #97
Template files are now directly loaded in the configurator container, so
that it is possible to run the configurator container directly, outside
of this project.
