Add some local contents
Switch back to DRF JSONEncoder

This will use ordered JSON representations, rather than alpha sorted
JSON.  This is worse for testing, but better for documentation.
Modify browser and browser-version resources

Removed browser.environment
Removed browser.engine
Added browser.note
Removed browser-version.engine-version
Added browser-version.note
Update view-by-feature-set for tab information
Removed engine and engine versions from view-by-feature-set
Fix and link to API root, update template
Add browser, browser-version resources
Add optional debug toolbar