browser: add colors support for Firefox >= v31

Part of #116.
browser: reset the "content" color via `color: inherit`

Necessary for Firefox v31, which seems to retain the previous
color from a previous %c color formatter when an empty string
is given.
dist: recompile
example: remove `console.info()` log usage

Annoying since the Web Inspector will add an exclamation point
with a blue circle around it to any debug() calls when `info()`
is used.