chore(*): add minimum version requirement to Vagrantfile
correction regarding providers

I'm pretty sure this is what you meant
pedantic capitalization fixes: VirtualBox & VMware

The capitalization they each use on their respective web sites is [VirtualBox](https://www.virtualbox.org/) and [VMware](http://www.vmware.com/) (ignoring when it's part of their logotype, in which case it's all lowercase).

I left one example of "Virtualbox" to avoid a merge conflict with my other pull request.  (I'm assuming you'll accept that one, but if you don't, and accept only this, then you'll want to manually fix that.... or I can send a third if you'd like.)
Merge pull request #135 from brandondrew/patch-1

correction regarding providers
Merge pull request #136 from brandondrew/patch-2

pedantic capitalization fixes: VirtualBox & VMware
Merge pull request #133 from jonboulle/master

add minimum version requirement to Vagrantfile
Added warning about token refreshing
Merge pull request #140 from bobrik/patch-1

Added warning about token refreshing
first implementation of coreos, nginx and hhvm, still not functional
sync folder

sync folder
adding hhvm
finally working
adding gitignore to remove logs
delete error log nginx
adding hhvm
adding hhvm