[WIP] numpy_ufunc: Allow custom ufuncs to be defined #1325

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EricCousineau-TRI wants to merge 3 commits intopybind:masterfrom

EricCousineau-TRI:feature/numpy_ufunc

Commits on Mar 17, 2018

detail/inference: Add rudimentary function signature inference utilities
EricCousineau-TRI
committed
numpy: Add ufunc and custom user dtype API. Ensure py::object and void can be found via dtype
EricCousineau-TRI
committed
numpy_ufunc: Allow custom ufuncs to be defined
EricCousineau-TRI
committed