fix some deprecation warnings and a broken test while sticking with a Jan2011-esque Gemfile #8
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I could not accomplish getting the stack trace cucumber (aruba) tests to work, but this fixes some simpler problems, and also cleans up if a test run fails & doesn't delete a test gemset. Ruby 1.8.7-p352 and 1.9.2-p290.
the sinatra-1.3-workaround I left in a separate pull request.