[WIP] Production-style config files.
[WIP] Hack in multiple server processes.
Add some documentation to the entrypoint.
Add libxml2-dev and move things around, again.
Remove hardcoded GALAXY_ADMIN setting. (oops)
Reenable the /shared volume check and tighten up.
[WIP] Configure nginx for multiple processes.
[WIP] Reload nginx after we change the config. :|
Check to make sure changes aren't already present.
Release SIGTERM in case we need it to bail out.
Change db name.
Bake the update into the intermediate image.
Update run script.
Remove (commented) nginx upload configuration.

The nginx upload module isn't included in debian builds of nginx any
longer. Besides, if we're doing things right we should be getting data
from network filesystems, not browser uploads.
Remove some cruft.
Add --system flag to useradd.
Backport some of the production startup.sh.