Add 'login required' site setting

app/models/site_setting.rb

@@ -135,6 +135,8 @@ class SiteSetting < ActiveRecord::Base
 
   setting(:send_welcome_message, true)
 
+  client_setting(:login_required, false)
+
   client_setting(:enable_local_logins, true)
   client_setting(:enable_local_account_create, true)
 

config/locales/server.en.yml

@@ -501,6 +501,8 @@ en:
 
     # TODO: perhaps we need a way of protecting these settings for hosted solution, global settings ...
 
+    login_required: "Require authentication to read posts"
+
     enable_local_logins: "Enable local authentication"
     enable_local_account_create: "Enable local account creation"
     enable_google_logins: "Enable Google authentication"