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

Corrected PHP error 
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
first version ipn orm manager
adding MongoDB entities
Extend configuration to handle ORM/ODM driver
Handle refunded messages
Extend error details
add ODM configuration example
reformat code examples
add full configuration example
fixed type error
Merging HEAD
fix order of chapter + extend description for drivers support
extending docu with mongodb section
Merge pull request #14 from piscis/master

Adding MongoDB Support