Use Case
======
Jeremy is a developer for Debian and Ubuntu. The same repository is
used for both Debian and Ubuntu packaging but with different branches.
For commits to the debian/master branch, Jeremy wants to use his
@debian.org email address. For commits to the ubuntu/master branch,
Jeremy wants to use his @ubuntu.com email.

Proposal
=======
The includeIf feature of git-config could be extended to offer a
gitbranch conditional include in addition to the gitdir conditional
include it already offers.

Thanks,
Jeremy Bicha