Test kitchen added

* jetty converges on Ubuntu 10.04 and 12.04
* Metadata name added - currently the name is derived from the directory which would lead to problem if you changed the directory where you kept the repo. A name is a requirement for testkitchen to work. (see FC045: Consider setting cookbook name in metadata)
* Readme rdoc ->  md - rdoc has been deprecated (See FC012: Use Markdown for README rather than RDoc) Removed mention of Ubuntu server 8.04 LTS as it has now been deprecated.

Tested using Virtualbox 4.3.8, vagrant 1.4.3, vagrant-berkshelf 1.3.7 and vagrant-omnibus 1.3.0. 64 bit Ubuntu images seem to require system hardware assisted virtualization support - but I don't know if that is just a problem for me. With this system the single command $ kitchen test ... will converge the tested nodes.