rewored JarStep to take keyword args (old way supported but deprecated)
updated copyright notices while I think of it
updated docs and tests to use JarStep the new way
added missing __future__ import. Sorry, Python 2.5!
Merge branch 'master' of github.com:Yelp/mrjob into the_jar_with_no_name
Merge pull request #824 from davidmarin/the_jar_with_no_name

The jar with no name