added user maintenance functional test

app/models/user_maintenance_mailer.rb

@@ -0,0 +1,14 @@
+class UserMaintenanceMailer < ActionMailer::Base
+  default :from => Danbooru.config.contact_email
+  
+  def login_reminder(user)
+    @user = user
+    mail(:to => user.email, :subject => "#{Danbooru.config.app_name} login reminder")
+  end
+  
+  def reset_password(user, new_password)
+    @user = user
+    @new_password = new_password
+    mail(:to => user.email, :subject => "#{Danbooru.config.app_name} password reset")
+  end
+end