Update libs/NiftyGrid/GridPaginator.php (~based on:

[j3nda]

hi,

this is feature for: GridPaginator() to use better setting of template by $templatePath. it's inspired by practical usage and existing pullrequest ~ https://github.com/Niftyx/NiftyGrid/pull/32 .

difference between "vinam" and "j3nda" is:

• public function __construct($templatePath = null)
• protected function setTemplate($templatePath)