[#44908065] Implement authorization checks for viewing and adding NodeSet instances using Tastypie API.
[#44908065] Remove PATCH and PUT methods from NodeSetResource since they are not used.  Derive GuardianAuthorization() from DjangoAuthorization() instead of Auhtorization() and clean up its code.
[#44908065] Refactor make_api_uri() and add unit test for retrieving correct NodeSet list using NodeSetResource.
[#44908065] Assign owner to NodeSet instances created via Tastypie API.
[#44908065] Change GuardianAuthorization to deny requests other than GET and POST, code cleanup.
[Delivers #44908065] Switch NodeSetListResource to use SessionAuthentication and GuardianAuthorization.
Add Fabric tasks to pull Refinery code from Github.
Merge branch 'nodeset_tastypie_auth' into develop
Updated django-tastypie to the latest version required by GuardianAuthorization.
[#44908065] NodeSetResource API now returns an empty list instead of HTTP 401 Unauthorized when no NodeSets exist.
[#44908065] Bug fixes in handling edge cases when reading NodeSets via Tastypie API.
[#44908065] Remove model-level authorization checking from GuardianAuthorization.create_detail().
Merge branch 'develop' of github.com:parklab/Refinery into develop
Fix for circular import errors.
Merge branch 'develop' of github.com:parklab/Refinery into develop
[Delivers #44908065] Implement creating NodeSets only by users who have read permission on the corresponding data set.