Enable ScalaTest to run just previously failed and/or canceled tests
Fixed problem with build.xml that snuck i with the previous merge and push, which
was so simple I figured I didn't need to do a clean build. (Famous last words).
Also added a comment.

Conflicts:
	src/main/scala/org/scalatest/tools/StringReporter.scala
Ensure open file handles are cleaned up in Memento. Added a TODO comment for George.