Stress mode for stress and concurrency tests

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I'd like for vogar to support running a single test with great aggression to 
help to detect race conditions etc. To accomplish this, I'd like to have 
options to run the same test in multiple concurrent threads and also multiple 
times in a row.

Perhaps:
  vogar --stress FooTest

Or similar. Such a test shouldn't be considered successful unless it runs all 
of its iterations successfully.

Original issue reported on code.google.com by [e-mail] on 21 Jun 2010 at 11:45