Performance improvement for `Reader.__shapeIndex`#52

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ARF1 wants to merge 7 commits intoGeospatialPython:masterfrom

ARF1:perf-opt-Reader__shapeIndex

Commits on Apr 7, 2016

Commits on Apr 8, 2016

__shapeIndex optimization: use memoryview slicing to skip unused field
ARF
committed

Commits on Apr 9, 2016

__shapeIndex optimization: use numpy when available for array arithmetic
ARF
committed