Merge pull request dropbox#347 from nickpegg/release-v1.4.4

Release v1.4.4

release 1.4.3

release 1.4.2

Merge pull request dropbox#333 from nickpegg/release-v1.4.1

Release v1.4.1

Release v1.4.0

Release v1.3.0

- Includes changelog and documentation updates.

Merge branch 'master' into release-v1.2.3

Release v1.2.2

Release v1.2.1

Release v1.2.0 (dropbox#293)

* Implement natural keys as primary keys for related fields (dropbox#292)

Closes dropbox#262

API
- Natural keys can now be used any place a primary key could be used for
  related fields on Interfaces and Circuits.
- For Circuits, the default is now to display the A/Z endpoint interfaces by
  their natural key (e.g. `device_hostname:name` format).
- For Interfaces, the Device hostname may now be used to create or retrieve
  interfaces (no more need to lookup the Device ID first)
- Bugfix in `NsotSerializer` when `view` isn't part of the context that caused a
  crash.
- Interface now has a `name_slug` field that can be used for natural
  key lookups. This is now also officially the natural key field.
- Network now has a `cidr` field that can be used for displaying
  the `network_address/prefix_length` without additional effort
- Network now has a `parent` field that can be used for displaying
  the parent CIDR without an additional lookup
- All underlying serializer code has been streamlined to reduce code
  duplication where possible.
- All "update" serializers have been moved to subclasses of "partial
  update" serializers with extra required fields specified as "extra
  kwargs" vs. re-defining the fields.
- The fields for `site_id` and `attributes` have been moved to the base
  `ResourceSerializer` since ALL resources inherit these anyways.

Util
- Util stats functions can now be directly imported from `nsot.util`