Add EventListener to complete Order
Add post creation Order events
Fix feedbacks
[OrderBundle] Item & order cost can't be negative
Adjust models constructors & phpdocs
Move order states to its interface

add some states, and delete unused confirmation mechanism
Merge pull request #899 from winzou/event/checkout

The Events - Checkout Revolution
Merge pull request #926 from winzou/statuses

Sylius states