Add underscore.js
Add DJANGO REST serializer classes
Added 'rest_framework', and 'django_verbatim' to list of installed apps
in settings.py
Added RESTFUL serializers, views, and URL configuration
add offers.js (contains the backbone stuff for working with offers)
/offers now wired up to get list of listings via backbone/the json api
Added the models primary key to the serializer so we can get the offer
ID via JSON