Introduces Vagrant.

This PR introduces vagrant so we don't need to install dependencies on our local machine; now, everything is sandboxed. The vagrant box will use the maven 3.3.1, tomcat7, and oracle's java7 packages. @jmeas and I replaced the information in the `readme.txt` to accurately portray how to start up the vagrant box.

Let me know if this is the appropriate forum for submitting a PR or if we need to send our PR (and how) to the mailing lists.
I think the first few lines of these are carry-over from our work on Master. We really only mean to add .DS_Store and .vagrant, I think.