bug 891962 - Vagrant 1.1.x configuration

So I've been using that for a few days now and believe this is the way to go.

- [x] it updates the vagrant config to the new configuration format, introduced in Vagrant 1.1

- [x] it adds an additional vmware, amazon ec2 and rackspace cloud configurations and I uploaded a ready image to my people.m.o space (for vmware)

- [x] it also cleans up the documentation a bunch, e.g. gets rid of the old data dumps and adds sections for the new vagrant backends

- [x] adds sphinx documentation system docs 

- [ ] uploaded a new box image for virtualbox