[composer] remove autoloading definition.
[composer] remove autoloading definition.

It creates problem while integration with paypal.

regularjack/JMSPaymentCoreBundle,schmittjoh/JMSPaymentCoreBundle,schmittjoh/JMSPaymentCoreBundle,regularjack/JMSPaymentCoreBundle,schmittjoh/JMSPaymentCoreBundle,schmittjoh/JMSPaymentCoreBundle,regularjack/JMSPaymentCoreBundle