Integate patch from peppelauro and added 1 example

link: scoumbourdis/grocery-crud#484 (comment)

This the description:
	 * Set custom views: allow to override default views as edit.php, add.php, ...
	 * $views is an associative array like ('edit.php' => 'myedit.php', 'add.php'=>'myadd.php)

Also added an example myedit.php on my theme, to call it just do;
$crud->set_custom_views(array('edit.php' => 'myedit.php'));

Author: Akir4d