Added ubuntu Saucy 13.10 boxes 

Adds 2 new boxes

- Ubuntu Saucy 13.10 for VMWare with [docker](http://www.docker.io/) pre-installed.
- Ubuntu Saucy 13.10 for Virtualbox with [docker](http://www.docker.io/) pre-installed.

Boxes have been created using [packer](https://gist.github.com/pulse00/47c6f55d2e5466f7ce7b)