Nsot

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* Bring a lot of documentation up to speed for readthedocs.org
* Added docstrings in places where there were none.
* Added code examples to some docstrings
* Updated requirements: Django==1.8.11

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* Fixes 171: Implemented API support for lookup by closest parent
* This implements a new detail route on the Networks endpoint at
``networks/{cidr}/closest_parent/``. The Network need not exist in the
database and if found, the closest matching parent network will be
returned.
* The endpoint also accepts a ``prefix_length`` argument to optionally
restrict how far it will recurse to find possible parents.

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* Migrated to built-in filtering of Interface objects in API.
* Also added the ability to filter by ``device__hostname``, e.g.
``GET /api/interfaces/?device__hostname=foo-bar1``

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* Fixes 169: Bugfix when filtering objects by 'attributes' in list view
* Fixed a bug that would result in a 500 crash when filtering by
attributes in list view if multiple sites have matching objects.
* Fixes 166: Added a settings toggle to display IPv6 in compressed
form. (See: ``settings.NSOT_COMPRESS_IPV6``)

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* Bugfix to filtering networks in API and bump.sh and update requirements.
* Fixed shebang in ``bump.sh`` and used it to bump the version!
* Upgrade requirements: certifi==2016.2.28
* Bugfix in API filtering for Network objects that would result in an
empty set if both ``include_ips`` and ``include_networks`` were set to
``True``.
* Added unit tests to extercise ``include_ips/include_networks`` filters,
because come on.

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* Made authentication API endpoints version-aware.

+ Overlooked the API authentication endpoints when doing the
API versioning.

* Moved API version header to root of tests so that the "API version"
message shows up on all executions of unit tests.
* Updated requirements django-rest-swagger==0.3.5.