fix livereplay crash
fix cx freeze util module not found issue
* fix wrong variable name
* report network errors to client
report network errors for replaywidget url fetches.
Merge pull request #85 from fafafaf/develop

Thanks for the contribution.
Merge pull request #89 from faf5678/replayfix

Thanks for fixing my stuff there. :-)
Add runtests.py and how to run it in readme