enh #94, added support for document/literal WSDL in generator

Resolves issue #94. Based on Zend 2.0 Soap Autodiscover class.

RPC/encoded is still the default, but Document/literal can be enabled by setting new properties:

* operationBodyStyle
* bindingStyle
* bindingTransport

Usage:

~~~php
    public function actions() {
        return array(
            'wsdl'=>array(
                'class'=>'CWebServiceAction',
                'serviceOptions' => array(
                    'generatorConfig' => array(
                        'class' => 'CWsdlGenerator',
                        'operationBodyStyle'=>array('use'=>'literal'),
                        'bindingStyle'=>'document',
                    ),
                ),
            ),
        );
    }

~~~