renamed v0.4 to v0.4.0, for consistency
Fix formatting of exception in _get_steps
Merge pull request #816 from kisielk/runner_error

Fix formatting of exception in _get_steps
Merge branch 'master' of github.com:Yelp/mrjob into hadoop_jar_io
fix odd indent in docs
tested input/output interpolation on Hadoop!
tested input/output interpolation on EMR