detect Scala version at runtime

GetVersion.scala

/** Use with a default value, for example:
 *  runningScalaVersion getOrElse "2.8.0"
 */
lazy val runningScalaVersion = {
  val matcher = """version (\d+\.\d+\.\d+).*""".r
  util.Properties.versionString match {
    case matcher(versionString) => Some(versionString)
    case _ => None
  }
}