SciTools/iris — pull request #1337 by bjlittle (2014-09-24 15:53:50+00:00)
Title: Product definition template 1.

This PR extends the new GRIB2 capability to include product definition template 1.

I'm conscious that I've created utility functions:
* `reference_time_coord`
* `forecast_period_coord`
* `validity_time_coord`

which could/may be more generic to accommodate future functionality. But since I don't have a use-case or pattern for *how* to make them generic, I'm leaving them as is and assuming that follow-on PRs will tend towards the *agreed* solution (@pp-mo)