To replace the misc/commit-msg.githook bash script Code mostly copied from golang.org/x/review/git-codereview/hook.go Fixes issue #590 Change-Id: I887cd32f9b6113d1a6b5d8b6eea6355da5706074
Context: http://camlistore.org/issue/408 Change-Id: I587de65c9dc8d87c02541096e1f4f7765e644962