Redirect all controllers to login if required

We want to skip the filter for sessions controller so that we can login
and we want to skip the filter for static pages because those should be
visible to visitors.

app/controllers/session_controller.rb

@@ -4,6 +4,7 @@ class SessionController < ApplicationController
   #  page is going to be empty, this means that server will see an invalid CSRF and blow the session
   #  once that happens you can't log in with social
   skip_before_filter :verify_authenticity_token, only: [:create]
+  skip_before_filter :redirect_to_login_if_required
 
   def create
     requires_parameter(:login, :password)