added a test that demonstrates issue 86

- https://github.com/FasterXML/jackson-dataformat-xml/issues/86
- can not deserialize unwrapped list when
  @JacksonXmlProperty.localName matches JacksonXmlRootElement.localName
- related: http://stackoverflow.com/questions/20673153/can-not-deserialize-unwrapped-list-when-jacksonxmlproperty-localname-matches-j