Version 0.1.1

* Change package description
* This version is just to work around the mess
  I left when I tried to upload the package
  to npm for the first time.
Use only absolute URLs in README
Add Travis config file

According to [1], Travis by default will `npm install`
and `npm test`, so there should be no need for a more
complex configuration.

[1]: http://docs.travis-ci.com/user/languages/javascript-with-nodejs/