Various improvements.

Added debug info for processing commands through aspects.
Performance improvements for Stopwatch (use GetTimestamp instead of creating new Stopwatch).
Added command level duration.

TODO: Aspects still dont work in WCF with RestApplication service. Castle/WCF conflicts with attributes.
Caching DB connections outside of driver.

Close on connection is expensive.
Try to reuse valid connections without invoking Close.
Added global connection manager to provide connection instances.