[SoapBundle] Moved configuration of ComplexType aliases from config to PHP objects with annotations

Before:
    # config.yml
    be_simple_soap:
        services_classmap:
            Cutomer: My\Bundle\Entity\Customer
            Cart:    My\Bundle\Entity\Cart

After:
    <?php

    namespace My\Bundle\Entity;

    use BeSimple\SoapBundle\ServiceDefinition\Annotation as Soap;

    /**
     * @Soap\Alias("Customer")
     */
    class Customer
    {
        // ... your PHP code
    }

    /**
     * @Soap\Alias("Cart")
     */
    class Cart
    {
        // ... your PHP code
    }