Ignore log files like .log.1
Merge pull request #85 from sealevelresearch/gitignore-tweak

Ignore log files like .log.1
Merge pull request #86 from sealevelresearch/dont-cascade-delete-from-view

Don't attempt to cascade a delete from a view
Add import_surge_predictions management command

- New app called surge_model_converter
- Mapping between ie `LVPL` and our internal Locations
- Database migration to make this mapping table and populate with
  Liverpool
- import_surge_predictions can keep track of which files is has already
  loaded

https://www.pivotaltracker.com/story/show/75795728 [Delivers #75795728]