update yaml to correctly create doxygen in /doc folder
update travis config
travis update...
aaand the last travis change
Update .travis.yml

moving gh-pages to github.com/acplt/open62541-www
nodestore_replace checks if the old node is already obsolete
update travis
adding a new (failing) test to check for extension object encoding
fixing the handling of extension object, relates to #141
adding new line