GRN-56: Correctly implemented the account verification flow (#367)

* Correctly implemented the account verification flow

* Fixed issues with redirect locations

db/migrate/20190206210049_add_activation_to_users.rb

@@ -0,0 +1,8 @@
+# frozen_string_literal: true
+
+class AddActivationToUsers < ActiveRecord::Migration[5.0]
+  def change
+    add_column :users, :activation_digest, :string
+    add_column :users, :activated_at, :datetime
+  end
+end