Added .gitignore.
Added .gitignore.

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