contrib/hooks/post-receive-email: Make revision display configurable
contrib/hooks/post-receive-email: Make revision display configurable

Add configuration option hooks.showrev, letting the user override how
revisions will be shown in the commit email.

Signed-off-by: Pete Harlan <4b9c65b503476ca26f001bc5ab10e60ae893d818@pcharlan.com>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git