Vagrant: Build and Tests are broken

[platinummonkey]

working up a PR, but had to fix the docker install location to get docker installed, needed to add the vagrant user to the docker group

Had to add the "latest" tag to the base proxy image container for the proxy containers to build properly

Tests are currently failing on "npm install"

vagrant@nginx-jwt:/vagrant/test$ npm install
npm ERR! Linux 3.13.0-49-generic
npm ERR! argv "/usr/bin/node" "/usr/bin/npm" "install"
npm ERR! node v0.12.7
npm ERR! npm  v2.11.3
npm ERR! path ../supports-color/cli.js
npm ERR! code EPROTO
npm ERR! errno -71

npm ERR! EPROTO, symlink '../supports-color/cli.js'
npm ERR! 
npm ERR! If you need help, you may report this error at:
npm ERR!     <https://github.com/npm/npm/issues>

npm ERR! Please include the following file with any support request:
npm ERR!     /vagrant/test/npm-debug.log

[platinummonkey]

NPM issue seems to have been caused by: npm/npm#7308 and http://stackoverflow.com/questions/24200333/symbolic-links-and-synced-folders-in-vagrant

Have a working install and tests going again. Will update Vagrantfile and README