* upgrade VMware Tools 9.9.0
* upgrade VirtualBox Guest Additions 4.3.20
* upgrade Rubygems 2.4.5
* upgrade Chef 12.0.1-1
* upgrade packer 0.7.5
* move Vagrantcloud/Atlas logic to Thor (remove post-processor)
* Vagrantcloud is now Atlas
* getchef.com is now chef.io