first non-working version as Python Crosswalk extension

Run inside cloudeebus dirctory with:

PYXWALK_PATH=`pwd` xwalk --allow-external-extensions-for-remote-sources --external-extensions-path=<path to dir of libpycrosswalk.so> examples/crosswalk/example.html

When it works, the xwalk HTML render window ends with
"[object Object]"

Copy the "// fails if repeated" line in extension.py a few times and
then the xwalk console output shows this error instead:

...
2014-06-12 14:33:52+0200 [-] *** Main() done
[0612/143352:INFO:CONSOLE(12)] "Uncaught ReferenceError: cloudeebus is not defined", source: file:///home/pohly/src/cloudeebus/cloudeebus/examples/crosswalk/example.html (12)

Note that I am running with Python 2.7 on Debian Wheezy. I can't rule
out that this is somehow broken, although the JS seems to make it to
the native core->SetJavaScriptAPI() fine.