* benchmark/driver.rb: some refactoring.

  (1) Remove `average differential'.
  In this benchmark driver, We should not care about `average'.
  We use fastest score because this score should not include
  any disturbances (affections of background process, etc).
  If you care about timing affect, I recommend `median'
  score with more than 5 examinations rather than simple
  `average' score (`average' score was affected by error scores).
  (2) Show log file name.
  (3) Change default directory from './' to driver's directory.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37224 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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