Remove \" from the user string before trying to extract name and email

Remove \" from the user string before trying to extract name and email

Signed-off-by: Frej Drejhammar <frej.drejhammar@gmail.com>
Reported-by: Cole Robinson <crobinso@redhat.com>
Thank's to Cole Robinson for reporting the bug and providing a fix
which was adapted to this patch.

The original bug report:

I was recently converting a few mercurial repositories to git, and
noticed certain commits had their date reset to Jan 1 1970.

An example repo:

http://hg.fedorahosted.org/hg/virt-manager

An example commit:

http://hg.fedorahosted.org/hg/virt-manager/rev/41182500ddef

After some poking, it seems the culprit was that the "author:" was
surrounded by quotation marks