Merge remote-tracking branch 'origin/master' into merge-upstream

Conflicts:
 	README.md
 	app/controllers/follower_accounts_controller.rb
 	app/controllers/following_accounts_controller.rb
 	app/serializers/rest/instance_serializer.rb
 	app/views/stream_entries/_simple_status.html.haml
 	config/locales/simple_form.ja.yml

app/controllers/application_controller.rb

@@ -15,7 +15,7 @@ class ApplicationController < ActionController::Base
   helper_method :current_flavour
   helper_method :current_skin
   helper_method :single_user_mode?
-  helper_method :use_pam?
+  helper_method :use_seamless_external_login?
 
   rescue_from ActionController::RoutingError, with: :not_found
   rescue_from ActiveRecord::RecordNotFound, with: :not_found
@@ -146,8 +146,8 @@ class ApplicationController < ActionController::Base
     @single_user_mode ||= Rails.configuration.x.single_user_mode && Account.exists?
   end
 
-  def use_pam?
-    Devise.pam_authentication
+  def use_seamless_external_login?
+    Devise.pam_authentication || Devise.ldap_authentication
   end
 
   def current_account