BLD: Make Travis use numpy-1.7 with python-2.6
BLD: Make Travis use numpy-1.7 with python-2.6

ThomasA/pywt,ThomasA/pywt,ThomasA/pywt,aaren/pywt,michelp/pywt,eriol/pywt,kwohlfahrt/pywt,kwohlfahrt/pywt,rgommers/pywt,rgommers/pywt,grlee77/pywt,michelp/pywt,aaren/pywt,michelp/pywt,eriol/pywt,kwohlfahrt/pywt,PyWavelets/pywt,rgommers/pywt,eriol/pywt,aaren/pywt,rgommers/pywt,PyWavelets/pywt,grlee77/pywt