Add XmlNamespace annotation documentation
Merge pull request #213 from jeserkin/xml-namespaces-docs

Add XmlNamespace annotation documentation
adds example for the default namespace
xml reference updated with virtual-property example
Merge pull request #215 from ribeiropaulor/master

xml reference updated with virtual-property example
add $this->maxDepth to serialize / unserialize
Merge pull request #218 from rothfahl/master

add $this->maxDepth to serialize / unserialize