Don't create RollupRules until necessary to be able to work with
some Java installations that lack Javascript ScriptEngine support.
Merge branch 'lazy-init-RollupRules' of https://github.com/koichirok/selenese-runner-java into koichirok-lazy-init-RollupRules
a little cleanup.
update release note.
Merge branch 'koichirok-lazy-init-RollupRules'