Use latest numpy for OSX builds
Use latest numpy for OSX builds

scikit-xray/scikit-xray,Nikea/scikit-xray,tacaswell/scikit-xray,tacaswell/scikit-beam,scikit-xray/scikit-xray,tacaswell/scikit-beam,tacaswell/scikit-beam,Nikea/scikit-xray,Nikea/scikit-xray,tacaswell/scikit-xray,tacaswell/scikit-xray,scikit-xray/scikit-xray