Add the ability for Rooms to have a URL.

The URL is shown on the schedule and the event/proposal page.
The URL is only when a user is logged in and registered.

app/views/admin/rooms/_form.html.haml

@@ -11,5 +11,8 @@
     = semantic_form_for(@room, url: (@room.new_record? ? admin_conference_venue_rooms_path : admin_conference_venue_room_path(@conference.short_title, @room))) do |f|
       = f.input :name, input_html: { autofocus: true }
       = f.input :size, label: 'Capacity', input_html: {size: 5}
+      = f.input :url, label: 'URL'
+      %p.small
+        The URL is only visible to registered attendees.
       %p.text-right
         = f.action :submit, as: :button, button_html: { class: 'btn btn-primary' }

app/views/admin/rooms/index.html.haml

@@ -12,6 +12,7 @@
         %thead
           %th Name
           %th Capacity
+          %th URL
           %th Actions
         %tbody
           - @rooms.each_with_index do |room, index|
@@ -21,11 +22,13 @@
               %td
                 = room.size
               %td
-                = link_to 'Edit', edit_admin_conference_venue_room_path(@conference.short_title, room.id),
-                method: :get, class: 'btn btn-primary'
-                = link_to 'Delete', admin_conference_venue_room_path(@conference.short_title, room.id),
-                method: :delete, class: 'btn btn-danger',
-                data: { confirm: "Do you really want to delete #{room.name}? Attention: This room will be removed from all Events that have it set"}
+                = room.url
+              %td
+                = link_to 'Edit', edit_admin_conference_venue_room_path(@conference.short_title, room.id), class: 'btn btn-primary'
+                = link_to('Delete',
+                    admin_conference_venue_room_path(@conference.short_title, room.id),
+                    method: :delete, class: 'btn btn-danger',
+                    data: { confirm: "Do you really want to delete #{room.name}? Attention: This room will be removed from all Events that have it set"})
 .row
   .col-md-12.text-right
     = link_to 'Add Room', new_admin_conference_venue_room_path(@conference.short_title), class: 'btn btn-primary'