Updated Rakefile to match README.md
Merge pull request #75 from Aaron1011/update_rakefile

Updated Rakefile to match README.md
And then 'cancel job' was born
Merge branch 'master' of https://github.com/travis-ci/travis-worker
Merge branch 'master' into staging
try using a previous ref of celluloid which we used before
add some more logging when a cancel job message is received
downgrading to atomic 1.1.1 fixed the cancel build explosions