Removed typo in className

lib/timeline/Core.js

@@ -55,7 +55,7 @@ Core.prototype._create = function (container) {
   this.dom.background.className           = 'vispanel background';
   this.dom.backgroundVertical.className   = 'vispanel background vertical';
   this.dom.backgroundHorizontal.className = 'vispanel background horizontal';
-  this.dom.centerContainer.className      = 'vispanel center jooo';
+  this.dom.centerContainer.className      = 'vispanel center';
   this.dom.leftContainer.className        = 'vispanel left';
   this.dom.rightContainer.className       = 'vispanel right';
   this.dom.top.className                  = 'vispanel top';