Tidying up commented-out code

Author: photonstorm

v3/src/paths/curves/Curve.js

@@ -217,11 +217,6 @@ var Curve = new Class({
             t2 = 1;
         }
 
-        // var pt1 = this.getPoint(t1);
-        // var pt2 = this.getPoint(t2);
-        // var vec = pt2.clone().sub(pt1);
-        // return vec.normalize();
-
         this.getPoint(t1, tmpVec2A);
         this.getPoint(t2, out);