added easier linux builds using vagrant

[headprogrammingczar]

Some distros don't package recent enough versions of dependencies to build this without a lot of manual work. Fedora happens to have all the right dependencies though, and the game still works if you copy it off the VM to another computer.

To test that it works, run the make command inside the VM, then copy the directory back out to your host box and run the game.

[ethchest]

But then you need to have vagrant installed and running...

[ThyReaper]

I'm not comfortable with adding that vagrantfile to the main repo. I'd recommend shipping it as a separate project that others could rely on.