Not every file in my repo is used for every build; I would like to see the change log limited to the relevant parts of the repo.

I've put together a working version of this, though I'm not sure if this should be

(1) Specified by the existing "sparse checkout" option
(2) Specified by the existing "polling ignores commits from certain paths"
(3) Specified by a new option "limit change log to certain paths"