Add Travisci to autoexecute jshint

Extra steps needed to enable this:
 - http://travisci.org/
 - Sign up for an account
 - Enable the relevant repository

This will add the ability to execute jshint automatically, and in pull requests (http://blog.travis-ci.com/announcing-pull-request-support/)

Example:
https://travis-ci.org/CloCkWeRX/steward/builds

Later, this could be part of a build pipeline. While travis doesn't offer the same power as something like jenkins, it does have decent artifact support (http://blog.travis-ci.com/2012-12-18-travis-artifacts/) and various hooks to trigger deployment.
http://docs.travis-ci.com/user/notifications/#Webhook-notification