Allow rendering of arrays unwrapped

[ilyanep]

This JSON Schema:

    "Foo": {
      "title": "Foo",
      "type": "object",
      "properties": {
        "uris": {
          "type": "array",
          "items": {
            "$ref": "#/definitions/Bar"
          }
        }
      }
    }

Yields this XSD:

   <complexType name="Foo">
      <sequence>
         <element minOccurs="0" name="uris">
            <complexType>
               <sequence>
                  <element maxOccurs="unbounded"
                           minOccurs="0"
                           name="Bar"
                           type="x:Bar"/>
               </sequence>
            </complexType>
         </element>
      </sequence>
   </complexType>

But ideally I'd have an option to make it render:

   <complexType name="Foo">
      <sequence>
         <element minOccurs="0" name="uris" type="x:Bar"/>
      </sequence>
   </complexType>

This would be more in line with both how protobuf's XML renderer library renders repeated elements and with what happens when I use Google's library to render a message into a JSON string and then use Jackson's XML data format to render that to XML.