Session is now flushed on 'thanks'

The session for the current guest now gets flushed from the queue when the thanks
page laods. Also, a field for 'responded' was added to the party model allowing
tracking of whether someone from that party has completed the rsvp. Data is saved
on the confirm page, but the responded field is not filled in until 'thanks' loads.
Briefly turning debug on on prod
revert settings.py for prod
/lodging/ now loaded from hotels model
Adds migrations
Troubleshooting
Adds conditional for urls in template
Add notes field to Events module
Adds a date field for events
Adds bride and groom fields for guests
Updated static assets, stylesheets, templates and views
Adds GA tracking code.
Adds a song request feature to the RSVP app