Checking in a merge of George's 48 branch, in which he added DiscoveryStarting and
DiscoveryCompleted events, and dealt with them in our reporters, including the
GUI reporter. Only regret is so far no spinning disco ball.



git-svn-id: http://scalatest.googlecode.com/svn/trunk@5256 fd1274fd-080f-5963-8033-43ee40fcd1de