Revert "Revert message bus upgrade"

This reverts commit 47e718f5b2.

config/initializers/100-verify_config.rb

@@ -0,0 +1,31 @@
+# Check that the app is configured correctly. Raise some helpful errors if something is wrong.
+
+if defined?(Rails::Server) and Rails.env.production? # Only run these checks when starting up a production server
+
+  if ['localhost', 'production.localhost'].include?(Discourse.current_hostname)
+    puts <<END
+
+      Discourse.current_hostname = '#{Discourse.current_hostname}'
+
+      Please update the host_names property in config/database.yml
+      so that it uses the hostname of your site. Otherwise you will
+      experience problems, like links in emails using #{Discourse.current_hostname}.
+
+END
+
+    raise "Invalid host_names in database.yml"
+  end
+
+  if !Dir.glob(File.join(Rails.root,'public','assets','application*.js')).present?
+    puts <<END
+
+      Assets have not been precompiled. Please run the following command
+      before starting the rails server in production mode:
+
+          rake assets:precompile
+
+END
+
+    raise "Assets have not been precompiled"
+  end
+end