Add changeset model, migration and tests
Test if changeset changed on Locality update
Wrap Locality updates in transactions
Add version attribute to every Locality model
Move Changeset fields and methods to AbstractModel
Add changeset handling to the admin interface
Add methods for comparing and detecting data changes
Implement partial data updates for locality and values
Merge branch 'develop' into changeset
Import everything from secret.py
Add DomainArchive model and tests
Fix bad settings module name
Use model_utils Tracker for detecting changes on models
Abstract UpdateMixin for handling changeset/version
Add social_user to changeset and update tests
Add AttributeArchive model and tests
Execute before_save method before checking for changes
Fix spelling test name spelling error
Add SpecificationArchive model and tests
Allow negative primary keys on archive models