Added few more packages/gem packages for running a full fledged kitchen
Slight tweaks to cvs-setup recipe based on food critic feedback
1) Changed Most of the packages to come via gem_install.
2) Added libxml2-dev and libxslt1-dev as requirements as gem install
   berkshelf and footcritic requires them.
3) Added test suite via .kitchen.yml file.
Minor edit to README.md