Fix remaining lint problems in crescendo.js
Fix remaining lint problems in crescendo.js

aaronmars/vexflow,aaronmars/vexflow,Silverwolf90/vexflow,Silverwolf90/vexflow,Huji/vexflow,Silverwolf90/vexflow,Tails/vexflow,Huji/vexflow,Tails/vexflow,aaronmars/vexflow,Tails/vexflow,Huji/vexflow