api: Add `drinks/last` endpoint.
Move Digital Ocean guide.
backup: Allow restore from an unzipped directory.
core: Update default `ml_per_tick` to match FT330.
Redirect after settings have changed.

This refreshes the `request.kbsite` context item.
Show full path to `local_settings.py` on dashboard.
Add demo data config file.
Predictably generate demo data.
Add test fixtures.
backend: add `delete_keg` method.
kegadmin: Add `Delete Keg` option.

Issue #295.
Update some field names.
v1.1.1