Autopublish drools-website, optaplanner-website and jbpm-website through travis

The jboss-tools guys already auto publish their awestruct website. xcoulon on irc #awestruct told me how they do this at Devoxx.

Travis is like Jenkins, but works really well for ruby stuff (such as awestruct websites). It can publish our websites automatically if we push a commit. Here's how to set it up:

• Add a .travis.yml file, look at this one for inspiration: https://github.com/jbosstools/jbosstools-website/blob/master/.travis.yml
• Get a secret token to be able to publish a website on jboss.org filemanagement server. Then encrypt that secret token with Travis's public key (so only Travis can decrypt it). Write the encrypted secret token in the travis.yml file. Remove all knowledge of the actual secret token, so it can't leak.