added continuity tests for cqt and hcqt on white noise
added continuity tests for cqt and hcqt on white noise

r9y9/librosa,Cortexelus/librosa,carlthome/librosa,Cortexelus/librosa,carlthome/librosa,stefan-balke/librosa,r9y9/librosa,carlthome/librosa,stefan-balke/librosa,stefan-balke/librosa,ruohoruotsi/librosa,ruohoruotsi/librosa,Cortexelus/librosa,r9y9/librosa,ruohoruotsi/librosa