Allow constructor overloading without loss of default WSDL URL
Allow constructor overloading without loss of default WSDL URL

now:
```php
class foo extends Service {
     __constructor($options =[], $wsdl = ''){
        ....
        parent::__constructor($options, $wsdl); // loss of default URL
    }
}
```

from now on:
```php
class foo extends Service {
     __constructor($options =[], $wsdl = ''){
        ....
        parent::__constructor($options, $wsdl); // no loss of default URL
    }
}
```

yethee/wsdl2phpgenerator,wsdl2phpgenerator/wsdl2phpgenerator,jongotlin/wsdl2phpgenerator,red-led/wsdl2phpgenerator,sha1/wsdl2phpgenerator,ivol84/wsdl2phpgenerator