CLOUDIFY-2551 changed create_or_ensure_exists logic
CLOUDIFY-2551 changed EP_FLAG in config to use_existing
CLOUDIFY-2551 changed externally_provisioned flag to use_existing flag, added flag logic to readme, minor fixes
Merge pull request #20 from CloudifySource/feature/CLOUDIFY-2551-create-or-use-existing-resources

CLOUDIFY-2551 changed create_or_ensure_exists logic