COOK-2556 - Change IP of Vagrant VM to avoid conflicts with other cookbook Vagrant VMs.

All Berkshelf Vagrantfiles spin up on :hostonly network IP of 33.33.33.10 by default. This change will modify the IP of the chef-server Vagrant guest, so that client Vagrant guests can run simultaneously without modification to any files.
Merge branch 'COOK-2556'
Update to cookbook to support Vagrant 1.1+

Vagrant 1.1+ is now installed system-wide so the Bundler requirement
(and associated Gemfile) have been removed! The README has been
updated to reflect new demo/dev environment installation and usage
instructions.