Include js bundles in statistics template
Add Piwik query utils
Add default settings
Handle event tracking disabled
Rename events tracking template
Rename enable tracking downloads setting
Add reports-related code
Connect with material downloaded signal
Add Piwik API wrapper related code
Refactor Piwik API wrapper into PiwikRequest
Add base and tracking queries
Add graph queries
Add metric queries
Refactor Report
Remove dummy template
Fix import errors
Post-WIP fixes
Use Serializer instead of Fossil
Fix server_url in injected templates
Format templates