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Pin dask + fix minor dask usage glitch, to get tests passing again ( 🤞 ) .
Changes are basically cherrypicked from #3127
NASTY PROBLEM :
Recent numpy (1.15 ?) uses different formatting for printing arrays in Python 2 + Python 3.
Alternative print solutions make the sample code very messy (as discussed offline with @lbdreyer).
I've fixed this for now by adopting the Python 3 output, and disabling the doctests on Python 2
However that is pretty wasteful, as a whole row of the Travis test matrix now does almost nothing.
I expect there is some way of controlling that, but for now I don't care enough.