CI build setup is fixed, email notifications improved

Hi all,

Rails CI build on had a problem yesterday, when Ruby started segfaulting somewhere inside Rake. I fixed it last night... by recompiling Ruby on server (?!)

Also, some people here asked to include changelog and a summary of Test::Unit errors in the email notifications CruiseControl.rb sends. It's done.

If you ever see that the CI build is failing when it shouldn't be (because of a problem with the server), do not hesitate to send me a heads-up message.

Your friendly build monkey, Alex

Thanks for the tuneup, Alex!