Added support for whenBothAre syntax.


git-svn-id: http://scalatest.googlecode.com/svn/trunk@4953 fd1274fd-080f-5963-8033-43ee40fcd1de
Enable composition of Normalizations with and.


git-svn-id: http://scalatest.googlecode.com/svn/trunk@4954 fd1274fd-080f-5963-8033-43ee40fcd1de
Renamed DecidedBy trait to Deciders.


git-svn-id: http://scalatest.googlecode.com/svn/trunk@4955 fd1274fd-080f-5963-8033-43ee40fcd1de