Another round of splash design

* Add map to splash
* Reverse venue<->conference relation
* Split venue address into fields
* Don't go through venue for lodgings anymore

app/views/conference/_conference_details.html.haml

@@ -10,14 +10,6 @@
             %small
               %b
               = date_string(conference.start_date, conference.end_date)
-          - if conference.venue.name and conference.venue.website and conference.venue.address
-            %p
-              %small<
-                = link_to conference.venue.name, conference.venue.website
-                ,&nbsp;
-                \#{link_to conference.venue.address, "http://maps.google.com/maps?q=#{conference.venue.address}"}
-          - if conference.venue.description
-            = simple_format(conference.venue.description, class: 'lead')
         .col-md-2
           .btn-group-vertical
             - if current_user.nil? || !current_user.subscribed?(conference)