Start adding django rest framework
(Stupidly) filter off our haystack indices

Only supports q={search} for full text search or project_id={x,y} for
searching by project. Filter needs to return a queryset, not a
SearchQuerySet, so this isn't really an optimal permanent solution
but it does the job at the moment.
Add authtoken authentication & project permissions
Update serializers to account for new note sections
Finish serializers & views for note sections
Add some basic tests (don't worry about passing)
Fix typos in api urls.py
Fix serializers and views to pass tests

Change how nested relationships work-- just make hyperlinks in note
sections. As in, when a citation section references a document, don't
embed that document-- just link to it. REST, REST, REST.

Refactor both so that the logic of getting a serializer from a section
type isn't duplicated over and over.

Rearrange stuff, etc.
Merge pull request #151 from editorsnotes/django-rest-framework

Implement [Django REST framework](http://django-rest-framework.org/) to create a simple API