Merge branch 'release/1.2.0' into develop
Freak out about Neighbourhood objects with id == 'neighbourhoods'

I'm not super happy with the way the exception is written, but it's
specifically exceptable, has a useful error message and is easily
tested, so from a user's perspective, it should be completely adequate.

cc. #1
Fix Python 3 ImportError.

cc. #1
Indent NeighbourhoodsNeighbourhoodException.__init__ less grossly.
Indent NeighbourhoodsNeighbourhoodException.__init__ less grossly.
Merge branch 'develop' of github.com:rkhleics/police-api-client-python into develop

Closes #1.
Bump version to 1.2.1.
Merge branch 'release/1.2.1'