Fix subscription button by hooking it back up.

app/assets/javascripts/subscription.js.coffee

@@ -7,6 +7,7 @@ class @Subscription
     @subscribe_button.unbind('click').click(@toggleSubscription)
 
   toggleSubscription: (event) =>
+    console.log 'toggleSubscription'
     btn = $(event.currentTarget)
     action = btn.find('span').text()
     current_status = @subscription_status.attr('data-status')

app/views/shared/issuable/_sidebar.html.haml

@@ -150,3 +150,4 @@
       new MilestoneSelect();
       new LabelsSelect();
       new IssuableContext();
+      new Subscription('.subscription')