Default $current for paginator in v0.3.1

[urieluvd]

The plugin versions for older php and elasticsearch has no $current argument in the SearchBuilder->paginate($limit = 25) and SearchBuilder->getCurrentPage() like in latest versions.

tag <= v0.3.1

    public function paginate($limit = 25)
    {
        $page = $this->getCurrentPage();
        $from = $limit * ($page - 1);
        $size = $limit;
        $result = $this->from($from)->size($size)->get();
        return new PlasticPaginator($result, $size, $page);
    }

tag >= v0.5.0

    public function paginate($limit = 25, $current = null)
    {
        $page = $this->getCurrentPage($current);
        $from = $limit * ($page - 1);
        $size = $limit;
        $result = $this->from($from)->size($size)->get();
        return new PlasticPaginator($result, $size, $page);
    }

tag <= v0.3.1

    protected function getCurrentPage()
    {
        return \Request::get('page') ? (int) \Request::get('page') : 1;
    }

tag >= v0.5.0

    protected function getCurrentPage($current)
    {
        return $current ?: (int) \Request::get('page', 1);
    }

It's a minimal change but it is really helpful for projects running on PHP 5.4.* and elasticsearch <= 5.* to return a paginated collection in an api instead of returning the pagination links.

I made a fork to use this asap but i think it would be a good enhancement for the real repo.
By the way thanks for the plugin, makes my life easier.