BUG: tests went missing from wheels after move to setuptools.
BUG: tests went missing from wheels after move to setuptools.

Closes gh-280

grlee77/pywt,PyWavelets/pywt,rgommers/pywt,rgommers/pywt,grlee77/pywt,PyWavelets/pywt,rgommers/pywt,rgommers/pywt