nvie/gitflow — pull request #360 by snowfix (2014-04-23 16:42:35+00:00)
Title: Be protocol-agnostic wrt/ Git URL's

Today's sub-module URL scheme is `git://` regardless of whether the top-
level (gitflow) repository. is SSH (`git@github:...), HTTPS
(`https://`) or Git socket (`git://`).

This small change uses relative URL's for sub-modules & hence re-use
the top-level repo URL model for the sub-module.