Add (initial) RSS feed parser for proceedings.

At the moment, parse_proceedings.py (python2) reads rss_feeds.txt and
expects one URL of an RSS feed per line. It doesn't do anything useful.
Panic commit. (Just in case. It's been a while.)

In the process of rewriting the parsing engine. The RSS feeds don't look
like they'll work. More to follow.
Merge branch 'master' of github.com:hackforwesternmass/uppd
Update schema and prepare scraper/parser for DB.

Schema still in no way final.