Mamaroneck, NY has no Region

[ddohler]

It is expected that cities outside the lower 48 have no region because the data we're drawing from doesn't cover them: #408 ). However, Mamaroneck, NY also wasn't able to be assigned a region by ./manage.py import_regions (Can't assign region to city Mamaroneck, NY). I assume that this is probably some kind of data issue that is causing Mamaroneck not to intersect with any of the region geometries.

[maurizi]

Low priority as we're moving away from requiring querying by city and towards using lat/lon for data requests.