Got first test working for contain newKey that uses KeyMapping.
Got should (contain newKey 7) syntax going.
Got first test passing for 'should not contain newKey ("three")' syntax.
Got initial 'and contain newKey ("one")' test working.
Got 'Map("one" -> 1, "two" -> 2) should (not contain newKey ("two"))' to work.
Merge branch 'master' of https://github.com/scalatest/scalatest
Merging in push of Scaladoc tweaks of LoneElement and GeneratorDrivenPropertyChecks.
Support 'or not contain newKey ("two")' syntax.
Finished ShouldContainNewKeySpec, which involved implementing the java.util.Map implicit
in the KeyMapping companion.
Did contain newValue all in one go.