Automatically add correct Neighborhood to Location on save. Display Neighborhood on admin page.
Location neighborhood_id updates on import if neighborhoods are imported last.
Move save from load_neighborhoods to Neighborhood.save()
docstring fix
Add a few more docstrings for completeness
Merge pull request #179 from CloudNiner/add_n_id

Add Neighborhood to a Location via foreign key relation. Import scripts keep the two synced when either is readded.