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

Before:
``` yaml
be_simple_soap:
    services_classmap:
        Cutomer: My\Bundle\Entity\Customer
        Cart:    My\Bundle\Entity\Cart

After:
``` php
<?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
}

src/BeSimple/SoapBundle/ServiceDefinition/Annotation/Configuration.php

@@ -21,10 +21,10 @@ abstract class Configuration implements ConfigurationInterface
     {
         foreach ($values as $k => $v) {
             if (!method_exists($this, $name = 'set'.$k)) {
-                throw new \RuntimeException(sprintf('Unknown key "%s" for annotation "@%s".', $k, get_class($this)));
+                throw new \RuntimeException(sprintf('Unknown key "%s" for annotation "@%s".', $k, __CLASS__));
             }
 
             $this->$name($v);
         }
     }
-}
+}