First round of rewriting error messages using FailureMessages in tests, for those that is affected by adjustments of contain matchers error messages.
Minor scaladoc fix in Containing.scala.
Adjusted error message for noneOf contain matcher to use 'at least one of'.
Fixed broken tests generated by GenContain.scala.
Merge branch 'contain-matcher-err-msg' of https://github.com/cheeseng/scalatest