added user_propsals to show all talks irrespective of conference

closes #1810

app/controllers/conferences_controller.rb

@@ -18,6 +18,11 @@ class ConferencesController < ApplicationController
     @program = @conference.program
   end
 
+  def user_proposals
+    event_types = EventType.where(title: 'Talk').collect(&:id)
+    @events = Event.includes(program: :conference).where(event_type_id: event_types).order(created_at: :desc)
+  end
+
   private
 
   def load_conference_by_domain