update gem bson_ext and devise initializer

config/initializers/devise.rb

@@ -43,7 +43,7 @@ Devise.setup do |config|
   # from others authentication tools as :clearance_sha1, :authlogic_sha512 (then
   # you should set stretches above to 20 for default behavior) and :restful_authentication_sha1
   # (then you should set stretches to 10, and copy REST_AUTH_SITE_KEY to pepper)
-  config.encryptor = :bcrypt
+  # config.encryptor = :bcrypt
 
   # Setup a pepper to generate the encrypted password.
   config.pepper = "a5a6b41c8a259f0642f9e8a51b77f3c671be92a430e021e00f7e0bcc71381c0698d3c3e9c1dc270872a16ed2703715e3b3b817245740bbb871a3411714944dce"