[PATCH 0/2] Introducing git-run-with-user-path program.

This is a new series I've mentioned earlier today.

 [PATCH 1/2] Introduce git-run-with-user-path helper program.
 [PATCH 2/2] Add sample ignore logic to git-run-with-user-path command.

The first one adds a path canonicalization helper with path
ignore hooks but no ignore logic implementation (it passes
everything that passes verify_path()).  The second one adds a
sample ignore logic implementation using PCRE.

Although the second one is done primarily as an example and to
start a mailing list discussion, it should be also safe to merge
if you decide to take patch 1, because the logic is used only by
git-run-with-user-path which is a new program. no Porcelain uses
right now.