Unix Time Updates.

This removes the `time` trigger from `UnixTime` as requested in #607.  It also updares the output to show the epoch as used and the time which results which is vaguely more useful.
@mwmiller haha okay -- and yes it'll eventually fallback to monospace if none of the others are installed.

@chrismorast is there a standard font-stack we should be using for fixed-width text?