Creating basebox that bundles default Vagrantfile configuration

This is the basebox that will be uploaded to Vagrant Cloud. This will
allow one-line deployments for any environments that are already
configured for Joyent.

This has been uploaded to Vagrant Cloud [here](https://vagrantcloud.com/apetresc/joyent-base64).

Closes #9.

TODO
=====
 - [x] Create basebox
 - [x] Upload box to http://vagrantcloud.com
 - [x] Update README