XMLReaderIterator v0.1.4.

- renamed XRN::asSimpleXML() to XRN::getSimpleXMLElement()
- fixed order of operation on XRI::moveNext()
- fixed iterator interface violation in XEI
- fixed XEI::toArray() logic
- fixed order of operation for XEI
- fixed error condition in XRN::asSimpleXML()
- added XRI unit-test
- added XEI unit-test
- updated docblocks
- maintain examples
- maintain XMLReaderIterator