Update for Vagrant 1.1

* Gemfile not needed anymore with self contained Vagrant install
* Modify README.md for Vagrant plugin install and remove Bundler usage
* Remove unneeded tasks from fixup cookbook and make sure Haml 3.0 is installed
* Berkshelf needs metadata.rb to find the local cookbook
Merge pull request #4 from whiteley/vagrant-1-1

Update for Vagrant 1.1