Use python2 shebang

Some distributions have switched to python3 as default and our code
breaks because it's python2 specific. Follow the PEP 394
recommendation.
Release 0.99.4
Robustness controls for webservice methods

Make sure the Journal will not break with webservice
extensions that do not use or miss some methods.

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>
Merge branch 'robustness-webservice' of https://github.com/tchx84/sugar into tch-robustness-webservice