TST: fix thousands of deprecation warnings during tests with numpy 1.8 on Python 3
TST: fix thousands of deprecation warnings during tests with numpy 1.8 on Python 3

E.g. `partsort_test.py:47: DeprecationWarning: using a non-integer number instead of an integer will result in an error in the future`
kwgoodman/bottleneck,kwgoodman/bottleneck,pydata/bottleneck,kwgoodman/bottleneck,pydata/bottleneck,pydata/bottleneck