Update src/Orderly/PayPalIpnBundle/Entity/IpnOrders.php

Corrected PHP error
Merge pull request #8 from piscis/patch-1

Update src/Orderly/PayPalIpnBundle/Entity/IpnOrders.php
Added missing dollar
Add Mongodb Entities
Merge branch 'master' of https://github.com/piscis/symfony2-paypal-ipn
Merge branch 'master' of https://github.com/orderly/symfony2-paypal-ipn