OR: Use HTTP instead of FTP for bill lists

Current scraper uses FTP to get a list of bills.  This branch switches the scraper to HTTP.  I did this because I'm  behind a restrictive firewall that blocks the FTP connection.  This might not be worth accepting to `sunlightlabs:master`, but here are some potential benefits of merging this and switching to HTTP:

1. I will try to add historical sessions to Oregon; that code will be based on this code.
2. Code is now fewer lines.
3. Current scraper appears to miss HB 2010 from 2013 Regular Session.