nginx conf separated into multiple files, updated gunicorn server script, other refactorings

- reworked nginx conf into two files: one master, with include calls to two other files; and an improved v1 conf
- updated the call to start gunicorn server to stay current with django 1.5
- refactored fabric commands dealing with updating of configuration files
- simplified django app's routing scheme, such that there's just the API endpoint; static files now handled by nginx completely.