handle Jobclient Null Pointer Exceptions

from https://issues.cloudera.org/browse/DISTRO-426, it looks like JobClient need its configuration set after instantiation.
Update Response.java

add response states for number of maps and reduces launched for a job
Update JobUtils.java

get number of maps and reduces tasks launched for a job
Merge pull request #5 from mnikhil-git/branch-0.2.2-mr1

handle Jobclient Null Pointer Exceptions