[WIP] Travis: build pyTuttle with numpy#558

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cchampet wants to merge 4 commits intotuttleofx:developfrom

cchampet:travis_buildWithNumpy

Commits on Jun 7, 2016

Travis: build tuttle binding with numpy
Clement Champetier
committed
pyTest: activate python tests with numpy
Clement Champetier
committed
CMake: added a warn message if cannot find numpy headers
Clement Champetier
committed

Commits on Jun 9, 2016

Travis: fixed import of numpy
Clement Champetier
committed