TODO:
/**
* Smarty plugin
* -------------------------------------------------------------
* File: function.bind.php
* Type: function
* Name: bind
* Purpose: includes template content
* -------------------------------------------------------------
*
* @param {array} $params
* $params['child_of'] Parent page of which you wish to get its children
* $params['assign_to'] Variable withing the template engine to which the content has to be assinged.
*
* @example
*
* EXAMPLE #1:
* {pages child_of="content-services" assign_to="services_pages"}
*
*
*/