SciTools/iris — pull request #1005 by bblay (2014-02-05 15:14:53+00:00)
Title: agg mask doc + tests

This delivers the internal requirement: _"Where an aggregator references a numpy.ma function, explicitly state that this is working with masked arrays. Where masking is not handled, explicitly state this as well."_

Where unit tests exist, I took the liberty of adding tests to ensure masked arrays were handled as expected (which led to #1004).