Updated project to use final release of SBT 0.13 (from RC4).
Turned on optimization during compilation (for both the SBT project sources and Facsimile's sources - although the former will have little impact in practice, it does at least ensure that all sources are compiled in the same manner).
Updated to use release 2.10.3 of Scala (from 2.10.2).
Updated to use Scalatest 2.0 RC2 (from 2.0 M5b). Also updated Scalatest dependency to utilize Scala-versioning, rather than explicit versioning.