Create script to publish Generated API docs

[mlvandijk]

When we make a release, the javadocs/scaladocs/yardocs are published as zip files alongside the jars.
If we should just pull down those jars post release, unzip them and add them to git? That can be done with a script.

Part of the cucumber-jvm release process would be to switch to your api.cucumber.io working copy and run a script. That script would download generated docs and add them to git. Then you push. For cucumber-ruby it would be similar.

Aslak recommends this:

1. Manually download zip files with javadocs, expand and add to git.
2. Automate that process with a script
3. Update release process doc with instructions how to run the script.

We could use bash scripting and/or make for this kind of stuff. It would be using curl to fetch docs.