Update and fix license headers for 2013.

Angst!
Missed some 'reddit's in compact/mobile/messaging
Use 'message the admins' in appropriate subreddit
Don't show removed comments in /comments listing
Remove reference to removed function.
Improve dev caching by naming static files based on mtime.
js: Display r.warn/error messages regardless of debug status.
spotlight: Replace stubs with internal fetch state.

Stubs are no longer necessary since replace_things is not being used by
fetch_promos any more.
spotlight: Add prefetch.
spotlight: Add fetch_promo throbber.
spotlight: Fade before first item is displayed.

This is intended to reduce the perceptual flash when promos load in.
Use consistent scaling on the timings graph

This lets one, at a glance, get a feel for how long a page took
to load. Timing data is scaled such that browser-width is 8 seconds
(unless the page took longer than 8 seconds). Clicking on the timings
will zoom the graph in for better investigation of what parts took
what amounts of time.
Remove memoize on normalize_hot.
url_escape expects unicode objects
adminbar: Allow multiple timings with the same key.
adminbar: Sort timings collection by start time.
stats: Collect timings related to template rendering.
adminbar: Style render timings.
adminbar: Layer short timeline events above long ones.
Proxy stylesheet hash in DefaultSR for front page stylin'.

Without a truthy stylesheet_hash property, the reddit.html template will
not include the stylesheet.