SciTools/iris — pull request #1362 by pp-mo (2014-10-06 07:50:05+00:00)
Title: Grib pdt 8

Following existing support for PDT 0, 1 and 31.
I stole @bjlittle idea of managing multiple mock.patches together without stacking up context managers, and made it into a helper method of IrisTest, so that is a separate commit.