Add functionality to allow comments to be included in class file

Resolves #29 and resolves #30 By allowing automated created of @property when the class files are generated.
As seen in the slug property a comment can be imported directly from the schema file. Aggregate and Composite relations are also handled with with cardinality="many" showing and array of ObjName in the description.

Original class files generated:
<?php
class myObject extends xPDOSimpleObject {}


This update creates class files with @property

<?php
class myObject extends xPDOSimpleObject {
/*
 * This file is part of geotracker.
 */       		
/**
 * This line should be a description of the class.
 *
 * @property string $name
 * @property string $standardAbrv
 * @property integer $postalAbrv
 * @property float $latitude 
 * @property float $longitude 
 * @property float $salesTax 
 * @property float $e911 
 * @property boolean $collectSalesTax
 * @property boolean $collectE911
 * @property boolean $disableOrders
 * @property string $capital
 * @property string $country
 * @property string $slug used for seo url creation
 *
 * @property array $Cities An array of geoCity objects
 * @property geoCountry $Country
 *       		
 * @author
 * @copyright
 * @license
 * @package geotracker
 */	   
}