function getAdminURL (item) {
	return '/' + this.keystone.get('admin path') + '/' + this.path + (item ? '/' + item.id : '');
}
Gets the Admin URL to view the list (or an item if provided)

Example:
    var listURL = list.getAdminURL()
    var itemURL = list.getAdminURL(item)

@param {Object} item