Issue #256, #257 - Fix unit tests part 1. Tests in azkaban-common no
longer produce output in source tree.
Merge pull request #273 from hluu/master

Need to handle all kinds of exception in order to properly set job's status
Merge pull request #271 from davidzchen/clean-tests

Clean Up Unit Tests Part 1
Issue #280: flowRunnerManager JMX bean : the NumExecutingFlows and RunningFlows values are not correct