Run MiniTest tests in both 1.8 and 1.9
Run MiniTest tests in both 1.8 and 1.9

* In the minitest gem (used only on Ruby 1.8),
  MiniTest::Unit.runner delegates to MiniTest::Unit.new and memoizes the
  result.  This method is not available in the Ruby 1.9 stdlib minitest,
  so we just instantiate a new MiniTest::Unit for cross-compatibility.

* In 1.8, class method MiniTest::Unit.runner:
  https://github.com/seattlerb/minitest/blob/bdbf38df3475dcc8ddd6d11ebede48cdd5f55008/lib/minitest/unit.rb#L808-815

* In 1.9, get a runner instance by constructing a new MiniTest::Unit:
  https://github.com/ruby/ruby/blob/v1_9_2_381/lib/minitest/unit.rb#L551-L590
  https://github.com/ruby/ruby/blob/v1_9_3_286/lib/minitest/unit.rb#L531-L883

latortuga/zeus,Lexxville/zeus,burke/zeus,stripe/zeus,matrinox/zeus,pelletencate/zeus,ylansegal/zeus,kgrz/zeus,stripe/zeus,kgrz/zeus,matrinox/zeus,pelletencate/zeus,ylansegal/zeus,Lexxville/zeus,burke/zeus,stripe/zeus,ylansegal/zeus,burke/zeus,kgrz/zeus,latortuga/zeus,pelletencate/zeus,matrinox/zeus,Lexxville/zeus,latortuga/zeus