upgrade to ScalaTest 2.1-RC1
upgrade to ScalaTest 2.1.0-RC3
upgrade to ScalaTest 2.1
add van Laarhoven lenses (like in SPJ's lens talk)
improve comment
upgrade to ScalaTest 2.1.1
travis linter says this is wrong to include
Merge remote-tracking branch 'origin/master' into scala-2.10.4

Conflicts:
	.travis.yml
upgrade to Scala 2.10.4