/**
 * Invoke a CSS animation on `this` angular.element instance.
 * @param className classname of animation to invoke on `this` element
 * @param delay delay before animation is invoked
 * @param done callback
 */
angular.element.prototype.doAnim = function(className, delay, done, doneDelay) {
    done = (typeof delay === 'function') ? delay : done;
    $timeout(function() {
        this.removeClass(className);
        $timeout(function() {
            this.addClass(className);
            $timeout(done, doneDelay || 0);
        }.bind(this), 100);
    }.bind(this), delay || 0);
};