stats: Fix urlpattern and fault handling
Improve urlpattern handling and use snf-django-lib api faults /decorator.
snf-stats-app: Add support for configurable URLs
Update Copyrights
Remove logger from the app settings
Loggers for all synnefo components should be configured insnf-webproject setting file '10-snf-webproject-logging.conf'.(see commit 4e4e49b)
Add /stats prefix in the app's urlpatterns.
Rename snf-stats to snf-stats-app