Port the changes from iris.fileformats.grib back into iris_grib.#82

Merged

pp-mo merged 2 commits intomasterfrom

Oct 17, 2017

Commits on Jun 25, 2017

Port the changes from iris.fileformats.grib back into iris_grib.
pelson
committed
This version would only support v2 of Iris, so we can only test against master.
pelson
committed