V2.0 dev -- postgresql db support added, production mode re-added, misc.

- added support for pgsql db connectivity (think so, anyway)
- production mode re-introduced (mostly with exact same functions from 1.0)
- removed all static files from the flask app itself
- slightly better comments on v2.0 nginx file
- made manage.py executable without explicitly invoking python interpreter, e.g. `./manage.py` to run the server.