[PATCH 1/3] Fix post-receive hook to not update the previously pushed commit

[Jeremy Kerr]

Hi Carl,

> Previously, the post-receive hook would always examine one commit that
> had been previously pushed, (when the purpose of the hook is only to
> example newly-pushed commits). We fix this by simply dropping the '^'
> in the commit-range specification.

Thanks for the series; I've applied it all, plus the fix for the 
post-receive hook.

Are you okay with me adding your signed-off-by line to all four patches?

Cheers,

Jeremy