allow multiples hook
suggested by Vadim Gelfer
This patch allows to have multiple hooks of the same kind:
for example
commit.email = /my/email/hook
commit.autobuild = /my/build/hook
Metadata-Version: 1.0
Name: mercurial
Version: 0.7
Summary: scalable distributed SCM
Home-page: http://selenic.com/mercurial
Author: Matt Mackall
Author-email: mpm@selenic.com
License: GNU GPL
Description: UNKNOWN
Platform: UNKNOWN