Better debugging tools
Add pry-rescue
Add therubyracer
Provide Vagrantfile
Add ansible playbook
Use VirtualBox shared folders on Windows

rsync proves unreliable.
Fix path to playbook
Fix script error when initializing rbenv
Workaround networking issue by assigning fixed IP
Use SMB shared folders on Windows
Make sure bash_profile exists
Disable SMB shared folders

SMB shared folders proved to be unreliable.
Merge branch 'demo/vagrant'
Add usage instructions