Update rails to version 4.0.3

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Refer to release docs.
 Merge branch 'rails-4-0-3' into 'master'

Rails 4.0.3

Blog post with more information http://weblog.rubyonrails.org/2014/2/18/Rails_3_2_17_4_0_3_and_4_1_0_beta2_have_been_released/
 Merge branch 'link-release-docs' into 'master'

Link Release Docs
Mention new rails in changelog

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>