[CartBundle] Try to initialize cart if data can be found in storage.
[CoreBundle] Little adjustments to Order fixtures creation
Merge pull request #936 from stloyd/bugfix/cart_initialization

[CartBundle] Try to initialize cart if data can be found in storage.
Merge pull request #937 from stloyd/bugfix/orders_fixtures

[CoreBundle] Little adjustments to Order fixtures creation
Fix issues found by SensioLabsInsight & Scrutinizer-CI