added invites

app/helpers/moderator/invitations_helper.rb

@@ -0,0 +1,10 @@
+module Moderator
+  module InvitationsHelper
+    def level_select
+      choices = []
+      choices << ["Privileged", User::Levels::PRIVILEGED]
+      choices << ["Contributor", User::Levels::CONTRIBUTOR]
+      select(:invitation, :level, choices)
+    end
+  end
+end