gradient() function now supports datetime64 and timedelta64#167

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WeatherGod wants to merge 4 commits intonumpy:masterfrom

WeatherGod:gradient_fix

Commits on Sep 27, 2011

gradient() function now supports datetime64 and timedelta64
WeatherGod
committed

Commits on Jan 22, 2012

Commits on Jan 25, 2012

Use empty_like() in the gradient function to maintain C/F-order
WeatherGod
committed