Add a comment, convert warn to log
Allow extensions to be written in CoffeeScript, convert AutoTitles.
Convert Floaty ext to CS, fix a few bugs, change theme to default
Make base-font-family overrideable, set default font to Avenir.
Nix settings.trackScrollPositions

This happens by default when using -webkit-overflow-scrolling: touch.
We're too clever to need these anymore.
Nix unused debug setting