Add test for restroom reverse-geocoding.

[tcmal]

See PR #529

• Added force_geocoding attribute for geocoding a model even when the test environment is active.
• Added weird_restroom factory.
• Added geocoding stubs for weird_restroom.
• Added test for reverse geocoding.

[DeeDeeG]

The build failed in Travis, but I don't think it's related to our code or this Pull Request.

What happened:

• Travis ran docker-compose run [. . .] which triggers the download for the postgres Docker image.
• Then there was an "authentication error" between Travis and (I think) the Docker hub.

Going to run the Travis build again, hopefully the error goes away.

---

From line 2279 of the Travis logs:

$ docker-compose run -e "RAILS_ENV=test" web rake db:test:prepare spec
Creating network "refugerestrooms_default" with the default driver
Pulling db (postgres:latest)...
ERROR: unauthorized: authentication required
The command "docker-compose run -e "RAILS_ENV=test" web rake db:test:prepare spec" exited with 1.

[DeeDeeG]

After restarting the Travis build, the tests now pass. Was just a quirk between Travis and Docker.