Do not convert subclasses of `ndarray` unless required#1118

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burnpanck wants to merge 8 commits intopydata:masterfrom burnpanck:member-arrays-with-units

+128-1

Commits on Nov 16, 2016

fixed dependency message for quantities testing, and added quantities to CI requirements
burnpanck
committed
fixing python 2.7 unittests compatibility issue
burnpanck
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Commits on Nov 18, 2016

implemented some of the improvements suggested by shoyer in the unittests
burnpanck
committed
changed preserving ndarray subclasses only for .data but not for .values
burnpanck
committed