modified system monitor to optionally log based on config parameter
added additional millis and passthrough for jira time parser. For use with USERGRID-1602
MeteringFilter now using new maybeLogPayload from UsergridSystemMonitor. Defaults to 15 seconds. For use with USERGRID-1602
Merge pull request #135 from apigee/USERGRID-1602

Usergrid 1602