Add 'invite only' site setting

app/models/site_setting.rb

@@ -134,6 +134,8 @@ class SiteSetting < ActiveRecord::Base
 
   setting(:send_welcome_message, true)
 
+  client_setting(:invite_only, false)
+
   client_setting(:login_required, false)
 
   client_setting(:enable_local_logins, true)

config/locales/server.en.yml

@@ -507,6 +507,8 @@ en:
 
     # TODO: perhaps we need a way of protecting these settings for hosted solution, global settings ...
 
+    invite_only: "Public registration is disabled, new users must be invited"
+
     login_required: "Require authentication to read posts"
 
     enable_local_logins: "Enable local authentication"