Nice Tutorial!... Works swimmingly... The only thing is that I've installed Drush as follow:
# composer global require drush/drush
# composer global require drush/drush:dev-master
because I got an error:
Your requirements could not be resolved to an installable set of packages.
- Installation request for drush/drush dev-master -> satisfiable by drush/drush[dev-master].
- drush/drush dev-master requires codegyre/robo ~1.0.0-beta1 -> satisfiable by codegyre/robo[1.0.0-beta1] but these conflict with your requirements or minimum-stability.
Installation failed, deleting ./composer.json.