Introduce Program to include cfp/rooms/tracks/events/event_types/difficulty_levels

app/views/proposal/_encouragement_text.html.haml

@@ -1,20 +1,20 @@
 %p.lead
-  - if @conference.event_types.any?
+  - if @program.event_types.any?
     You can submit proposals for
     = "#{event_types(@conference)}."
-  - if @conference.tracks.any?
+  - if @program.tracks.any?
     Proposals should fit in one of the
-    = "#{pluralize(@conference.tracks.count, 'track')}:"
+    = "#{pluralize(@program.tracks.count, 'track')}:"
     = "#{tracks(@conference)}."
-  - if @conference.cfp_open?
+  - if @program.cfp_open?
     The submission period has begun
     %em
-      = @conference.call_for_paper.start_date.strftime('%A, %B %-d. %Y')
+      = @program.cfp.start_date.strftime('%A, %B %-d. %Y')
     and closes
     %em
-      = @conference.call_for_paper.end_date.strftime('%A, %B %-d. %Y.')
+      = @program.cfp.end_date.strftime('%A, %B %-d. %Y.')
     That means you have
-    %b= pluralize(@conference.call_for_paper.remaining_days, 'day')
+    %b= pluralize(@program.cfp.remaining_days, 'day')
     left!
     Remember
     = @conference.title