upgrade VMware Tools 9.8.4
upgrade VirtualBox Guest Additions 4.3.18
introduce Parallels Desktop support
re-organize repository to match [opscode/bento](https://github.com/opscode/bento)
add Thorfile for automating testing and build
add [travis-ci](https://travis-ci.org/ffuenf/vagrant-boxes) testing (validate packer templates)
[post-processor] automate generation of SHA256 / SHA512 checksums
[post-processor] automate upload to Amazon S3 eu-central-1 (Frankfurt)
[post-processor] automate vagrant-cloud release and metadata
depreciate hosting on Google Drive