Refactored snippet list view.
Refactored single snippet view.
Added format suffix handling to views and to urlconf.
Refactored views to class-based views.
Modified urlconf for class-based views.
Using rest_framework's generic classes to cut down views.py.
Added author and highlighted HTML to snippet model. Added User serializer.
Added views for users and wired them into the urlconf.
Added pre_save methods to snippet views.
Updated serializer to reflect owner relationship.
Added permission classes to snippet views.
Added login urls to project urlconf.
Added permissions module.
Populated permissions module: any user can read, only the owner can write/modify/delete.
Added new permissions class to snippet detail view.