Drush, Bundler and Permissions.

This release provides:

• Updates docs.
• Using Drush install of Mink to install.
• Composer to install Drush. Phing target to make sure it's always available.
• Bundler support to handle puppet and librarian-puppet gems in the Vagrant host.
• Fixes permissions UID and GID issue.

Note: Requires reprovision.