launcing workers and master in parallel.
Specifically, don't wait for the process to finish. We have ensureMasterStart() and worker heartbeast so there won't be bad states.
Merge branch 'master' into jwang_launchWorkerInParalell

Conflicts:
	src/edu/washington/escience/myria/util/DeploymentUtils.java
Merge pull request #628 from uwescience/jwang_launchWorkerInParalell

launcing workers and master in parallel.