Update binaryTests.scala

Parameterless case classes are no longer allowed, see https://github.com/scala/scala/commit/c6961e0fb8ca55d312fcc04272b3bfc983e56854
Another change to binaryTests.scala

Enumerations no longer accept a List[String]
Further updates for 2.11 compatibility; bump to sbt 0.13.0

The following changes are included:
- bump scalacheck to 1.10.1 (for 2.11)
- include test dependencies with 2.11
- update xml to 1.0.0-RC5
- update sbt to 0.13.0, in order to take advantage of the
new definition of isStable/isScalaApiCompatible

It will now compile and test successfully with Scala 2.11.0-M5.