Release process

Basically the same thing as https://github.com/hoodiehq/hoodie-cli/pull/117.

As this package is also available on npm someone™ with the necessary rights should run `travis setup npm`. See [here](https://github.com/hoodiehq/hoodie-cli/blob/master/.travis.yml#L7-L14).

The SauceLabs configuration is broken and fails the build.

@gr2m @svnlto