Created separate jobrunner user
Made cloudwatch creds file readable by the mapred user
Removed s3 fs from hadoop config. Removed private key for cluster user
Allow jobrunner to switch to mapred to submit an iteration job.
Merge pull request #6 from rescale/run-iteration-as-mapred

Allow jobrunner to switch to mapred to submit an iteration job.
Explicitly specifying the shell to use now
Merge branch 'run-job-as' of github.com:rescale/whirr into run-job-as
Merge pull request #5 from rescale/run-job-as

Created non-mapred user to run job code as