Vagrant configuration to instantiate development boxes easily

Vagrant allows to create virtual machines for software development. Added a configuration to create a friendica server using 'vagrant up'.

See documentation of vagrant here: http://www.vagrantup.com/

This configuration worked on my Ubuntu 14.04. machines but might need some tweaking. The Vagrantfile is based on Vaprobash (https://github.com/fideloper/Vaprobash). 

I will add documentation for the wiki in the next few days.