Adding Vagrant configuration

- added Vagrant configuration using Chef
- the Chief config will install ruby 2.1.3 with postgresql 9.3 in a ubuntu trusty vm
- access to the project from the host can be made using localhost:3000 (do a 'vagrant ssh' to the guest and run 'rails s')
Adding to the Vagrant file and README.md references about the Vagrant setup
Merge pull request #5 from ramirovjr/master

Adding Vagrant