Clojurians Log v2

checking the change there from github ... i always try to avoid locking resources that i get from secondary libraries. it's always just asking for trouble when the "other guys" start to lock the same thing without a warning. sometimes i just use wrappers around them for that sole reason.

The original locking was added for Connection to address a specific bug some folks ran into. It then was transitively applied on DataSource by accident when that code was refactored, so this is just a fix for that. The underlying lock has been in place for a long time.