Remove rbenv dependency from deploy scripts
Get :bundle_cmd dynamically from environment

Just in case someone's doing something funky with their Ruby versions manager
Include CMS URL in generated config

For use by the provisioning scripts
Put Ruby version-patchlevel into site deploy config

Again for use by the provisioning scripts.
Make capistrano run everything in a login shell

This is easier than coding the deploy config to cope with a particular ruby version manager.
Make sure Schema IDs serialize themselves properly