/uptime command to see bot's uptime

[dragfyre]

/uptime - returns the bot's uptime formatted by istr().

[dragfyre]

Removing from Release 1.1; this isn't really critical functionality and it's already partly addressed by the bot checkin system (which is viewable by admins). May be a nice to have for later.

[brettz9]

This should also be implemented, pending your review.