unexpected WARN while using `with-resource-id`, lift-3.0-SNAPSHOT

Mailing list topic: https://groups.google.com/forum/#!msg/liftweb/z5rKAxR0y08/S811GG3BLmsJ

The actual bug is with having a WARNing:
01:50:52.564 WARN  [qtp1170205978-851126 - /img/favicon.png?F1171910628180AB1FAH=_] net.liftweb.http.LiftRules - Unmapped Lift-like parameter seen in request [/img/favicon.png]: F1171910628180AB1FAH