Adding lib/journey.rb to use require 'journey'

[arunagw]

This file can have more require later. But now it fixes the failing rails test.

Failing tests http://travis-ci.org/#!/rails/rails/builds/210775/L91

Changed commit in rails https://github.com/rails/rails/commit/99888487b63b313ea4495edd24b666fc5a3c8fe0