You can clone with
HTTPS or Subversion.
yogi has init which builds the directory structure that is required. For shifter, it by default, also expects the same directory structure.
instead of (relative to builder.json):
Since shifter expects a certain directory structure, I think it would be beneficial to have shifter able to generate the directory for us using an init command. This is especially useful for yui projects that are folders within a larger and more complex project and already use git in the root. Yogi, forces us to have a git at the top level for our modules, otherwise it refuses to run init, so shifter is a better fit for projects like this.
I don't think I want to add this to shifter, but I'll leave it here in case I get to it.