changes from comments, fix commercials failing test

app/helpers/application_helper.rb

@@ -203,4 +203,12 @@ module ApplicationHelper
   def show_roles(roles)
     roles.map { |x| x[0].titleize + ' ' + x[1] }.join ', '
   end
+
+  def can_manage_volunteers(conference)
+    if (current_user.has_role? :organizer, conference) || (current_user.has_role? :volunteer_coordinator, conference)
+      true
+    else
+      false
+    end
+  end
 end