CC-5709: Airtime Analyzer

* Explicitly set the locale in upstart conf to avoid UTF-8/unicode
  errors from python. Fixes CC-5794.
CC-5709: Airtime Analyzer

* Fixed the unit tests
* Improved length testing because it seems to fluctuate a bit with
  your mutagen version (great, eh?)
CC-5781: Upgrade script for new storage quota implementation

Changed airtime conf file path so it works for saas or self-hosted users
Merge branch 'cc-5709-airtime-analyzer' of github.com:sourcefabric/Airtime into cc-5709-airtime-analyzer
Merge branch 'cc-5709-airtime-analyzer' into cc-5709-airtime-analyzer-saas