Merge pull request #7 from willbryant/master

Fix distributed nitra if not using another gem that turns buffering off
Add bundler gem tasks
Merge pull request #10 from willbryant/master

Capture stderr from workers and show it on the master
Merge pull request #9 from proglottis/rakefile

Add bundler gem tasks
Merge pull request #11 from willbryant/master

implement --retry and --attempts options to rerun tests that fail due to...
Merge commit '421df1f'