Allow to specify extra template and cython build_ext flags as commandline params.
Allow to specify extra template and cython build_ext flags as commandline params.

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