WiP: refactoring XPath conversion and moving it outside of the PHP serializer
Updated 5.3 build script for new XPath convertor
Fixed annotation
XPathConvertor: reorganized code
XPathConvertor: moved/reordered tests
Updated Keywords test to use slightly less huge test strings in order to keep the old PHP 5.3 happy
XPathConvertor: removed extraneous argument, moved some code around
WiP