example and some base files

This version introduces multiple enhancements:

added base example files
added some base libraries

Details of additions/deletions below:
--------------------------------------------------------------

Added:      src/Base/Object.php
Added:      src/Data/Object.php
Added:      src/Data/DomXml.php
Added:      examples/footer.php
Added:      examples/header.php
Added:      examples/base_object.php