Set Breadcrumb

I had a problem for rename a existing breadcrumb, so we can do it easier with this.

    public function set_breadcrumb($name, $uri = '', $index = NULL)
{
    if(is_null($index)) {
        $this->_breadcrumbs[] = array('name' => $name, 'uri' => $uri );
    } else {
        $this->_breadcrumbs[$index] = array('name' => $name, 'uri' => $uri );
    }
    return $this;
}