New hook to update patch status on pull

[Simo]

In my setup I do not want to hook patchwork directly in the upstream 
master tree as I do not have access to it.

So I created this patch that will update the status of patches after a pull.

It adds some code in utils.py to performthe actual update and a 
post-merge hook that is called when my cron job does a git pull from master.

I have briefly tested this in a staging server, and will deploy on my 
site shortly.

HTH,
Simo.
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