SciTools/iris — pull request #996 by pp-mo (2014-01-30 17:06:35+00:00)
Title: Support lazy operations in cube.collapsed.

Derived from the more experimental https://github.com/pp-mo/iris/pull/5

**Will not work at present**
Because biggus still needs a couple of things...
- [ ] https://github.com/SciTools/biggus/pull/57
- [ ] a working ```biggus.Aggregation.masked_array()``` method