adzap/validates_timeliness — pull request #95 by will-ob (2013-03-05 02:16:48+00:00)
Title: Require 'active_model'

Apparently classes (and modules?) are lazily required when using autoload. Prompted by
'uninitialized constant ActiveModel::Validations'. Didn't have this problem until attempting to rails-4-ify an app

see https://github.com/rails/rails/issues/5768