UnitKit: support limiting the test classes to those matching a regex. e.g. pass a command line argument '-classRegex .*AttributedString.*' to test classes containing 'AttributedString'

git-svn-id: http://svn.gna.org/svn/etoile/trunk/Etoile/Frameworks/UnitKit@10195 7b3f36aa-e6db-49c1-8b4c-66eac1997e64