Provide feature to limit MRJob's stdout/stderr size

[huozhanf...@gmail.com]

Hi，friend：

     I have submit a JIRA issue on  "how  to limit MRJob's stdout/stderr size" 
and I have done a part of the work.

    @https://issues.apache.org/jira/browse/YARN-223

    This is a very meaningful feature , but now I meet with difficulties . So I 
need help.

    Thanks 



huozhanf...@gmail.com