Refactor commonly used queryset filters
Document Locality models
Rename private object methods to start with an _
More documentation for Locality models
Add more doc strings and comments
Move nlform to contrib.js
Fix spelling for api/locality/:uuid URL

Closes #121
Use a single changeset for a set of value changes

Closes #109
Discard data with bad geometries on import

Closes #116
Add template_fragment validation

Closes #89
Merge pull request #117 from dodobas/refactor_and_document

Refactor and document code