Merge pull request #232 from MarkDBlackwell/feature_megatest2

Pull request adding a mega-test for the entire Rails Example Apps system, along with mega Rake commands
Merge pull request #239 from MarkDBlackwell/feature_megatest2

Pull request for mega-test on Mac OS X (and NetBSD)
Merge pull request #240 from MarkDBlackwell/feature_megatest2

Remove Bashisms & increase portability
Use Rails 3 for now; fix reinstall; improve sed