Change to stft/istft to support user-provided window
Change to stft/istft to support user-provided window

carlthome/librosa,Cortexelus/librosa,yunque/librosa,stefan-balke/librosa,Cortexelus/librosa,r9y9/librosa,carlthome/librosa,craffel/librosa,Cortexelus/librosa,ruohoruotsi/librosa,craffel/librosa,ebattenberg/librosa,r9y9/librosa,imsparsh/librosa,craffel/librosa,ruohoruotsi/librosa,ruohoruotsi/librosa,stefan-balke/librosa,carlthome/librosa,decebel/librosa,decebel/librosa,r9y9/librosa,stefan-balke/librosa,ebattenberg/librosa,yunque/librosa,imsparsh/librosa