Added vagrant files for 1.3 vm

Installs:
*    OF 1.3 Softswitch
*    OVS Kernel Module
*    OF1.3 Wireshark dissector
*    Mininet
*    frenetic (OPAM)
*    ocaml-openflow (OPAM)
*    ocaml-packet (OPAM)
*    ocaml-topology (OPAM)
    

To use, install vagrant (http://www.vagrantup.com/), then:

``` 
cd frenetic/vagrant
vagrant up
vagrant ssh
```

And you're in a fresh new VM!