this.el.removeClass(['fade','top','bottom', 'left', 'right','in',
'bs-tooltip-top','bs-tooltip-bottom', 'bs-tooltip-left', 'bs-tooltip-right']);
+
+ this.el.addClass(this.bindEl.attr('tooltip-class'));
var placement = typeof this.placement == 'function' ?
this.placement.call(this, this.el, on_el) :