Use Vagrant 1.1 configuration api
Merge pull request #31 from iamjarvo/upgrade_vagrant

Use Vagrant 1.1 configuration api
revises style from 8e2a841e11a9a92e58175ff7c8a615666217f6e3
Vagrant 1.1+ is now required
documents running bundle install in the recommended workflow [Adam Williams & Xavier Noria], [Closes #30]
Merge remote-tracking branch 'rails/master'