(GH-3) Add script to set up App::GitHooks.
(GH-3) Add githooks utility to the scripts installed.
(GH-3) Implement "githooks version".
(GH-3) Make sure bin/githooks compiles.
(GH-3) Only require a git repo for commands that need it.
(GH-3) Add new prereq.
(GH-3) Add new test directory to Makefile.
(GH-3) Display result when installing/uninstalling.
(GH-3) Test "githooks" utility.