tests/test-hook

Add an sshrepository class and hg serve --stdio

#!/bin/sh -x

hg init
echo "[hooks]" > .hg/hgrc
echo 'precommit = echo precommit hook' >> .hg/hgrc
echo 'commit = echo commit hook: $NODE' >> .hg/hgrc
echo a > a
hg add a
hg commit -t "test" -u test -d "0 0"