Automated building RLSD in a VM with Vagrant.

This makes it easier to build both the 32- and the 64-bit version
of RLSD in a repeatable way, especially if you're not running
Ubuntu 14.04 yourself.
Can now choose between 32- and 64-bit build in VM.
Merge pull request #45 from dbohdan/master

Build RLSD in a VM with all build dependencies automatically installed using Vagrant