Dropped AkkaFutures; Scaladoc'ed Outcome. Moved OutcomeOf to its own source file. Started
the process of deprecating FailureOf.
Improved Scaladoc of OutcomeOf, finished deprecation of FailureOf,
made DocSpec, DocSpecLike, and tools.ProgressBarPanel private[scalatest],
changed a few remaining expectResult's to assertResult.