add -s/--signoff option to add SOBs to commit when emailing
add -s/--signoff option to add SOBs to commit when emailing

Signed-off-by: Michael Roth <04e3c7ed0b6a5be8ee7105f6c521ea7c8e5b8c37@linux.vnet.ibm.com>
Signed-off-by: Stefan Hajnoczi <484520986196e4a799496429ce8a499eb6488adb@gmail.com>

stefanha/git-publish,stefanha/git-publish