Easing doesn't work on class animations (single-line fix)

[dtetto]

Easing is always null on any animateClass() calls due to line 81 of effects.core:

var ea = (typeof easing == "object" ? easing : null);

When specified, easing is a string, not an object. The following should fix:

var ea = (typeof easing == "string" ? easing : null);

[paul]

Fixed in r1539. Thanks!