Further work to address some issues with supporting the interaction between standard password authentication and rememberme in situations where an individual is not allowed to be logged in twice at the same time.
Updating to cross-compile for Scala 2.9.2 and 2.10.0 using sbt 0.12.1

In order to do this the posterous-sbt plugin has been disabled as it
does not appear to be available for sbt 0.12.1 at present.