Upgrade to Rails 4.2

[kcomandich]

Currently we're at 4.0.2.

http://weblog.rubyonrails.org/2014/9/12/Rails-4-1-6-and-4-0-10-has-been-released/
"In keeping with our maintenance policy, after the upcoming release of 4.2.0, the 4.0 series will be retired. It will not receive further updates for either bug fixes or security issues. All users are urged to migrate to 4.1 as soon as possible."

I think severe security issues will still be fixed. See http://guides.rubyonrails.org/maintenance_policy.html

It appears the 4.2 final version will be released by the end of 2014.