Use new rubinius and don't use jruby-head on travis
Use new rubinius and don't use jruby-head on travis

Travis and Rubinius no longer use the 
rbx-18mode/19mode syntax for .travis.yml. 

http://rubini.us/2013/12/03/testing-with-rbx-on-travis/
moneyadviceservice/postcode_anywhere-email_validation,moneyadviceservice/postcode_anywhere-email_validation