Check authentication on each request (#26)

Reviewed-on: #26

app/models/current.rb

@@ -0,0 +1,3 @@
+class Current < ActiveSupport::CurrentAttributes
+  attribute :user
+end

app/models/guest_user.rb

@@ -0,0 +1,3 @@
+class GuestUser
+  def registered? = false
+end

app/models/user.rb

@@ -1,3 +1,5 @@
 class User < ApplicationRecord
   has_secure_password
+
+  def registered? = true
 end