added rbf support for recurrence plots
added rbf support for recurrence plots

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