Fixed errors in example configs, updated the message for reading product config
Removed the need for lxml, use the standard lib xml.etree.ElementTree instead
Removed references to lxml which is not used anymore
Added try/except blocks to make the production more robust, changed config item "service" to "topic"
Renamed config item "service" to "topic"
Merge remote branch 'origin/develop' into feature-aapp-and-npp

Conflicts:
	trollduction/trollduction.py
Rename trollduction.py to producer.py to avoid confusion with package name.

Signed-off-by: Martin Raspaud <martin.raspaud@smhi.se>
New xml format.

Signed-off-by: Martin Raspaud <martin.raspaud@smhi.se>
Add trollduction unittest skeleton.

Signed-off-by: Martin Raspaud <martin.raspaud@smhi.se>