- Updated generate-json.py to support addons_contrib (previously ran into an unhandled UnicodeDecodeError).
- 'download_url' key now works; used with http://localhost:8000 for now.
- index.json generated with updated generate-json.py, now contains addons and addons_contrib.
- Add-on directory name was not a proper identifier before.
- index.json was formatted incorrectly (missing commas); new version is generated with updated generate-json.py (which seems to fail for addons_contrib at the moment), and contains data for add-ons in addons repo.