Use Travis CI
Use Travis CI

This will increase visibility into whether a build or pull request is
passing/failing in multiple environments.

Signed-off-by: Stephen Celis <06fa905d7f2aaced6dc72e9511c71a2a51e8aead@stephencelis.com>

SupportPay/recurly-ruby,SupportPay/recurly-ruby,SupportPay/RecurlyDemoNew,SupportPay/RecurlyDemoNew