Add job-flow-role and service-role args

This involved updating to a later version of the AWS SDK and resolving
the dependency of the org.apache.commons.codec lib as well as fixing a
small bug in the s3 layer.
Merge branch 'master' of https://github.com/Satshabad/lemur

Conflicts:
	project.clj
	src/main/clj/com/climate/services/aws/emr.clj