CFY-446 dont print None node id's
Merge pull request #44 from CloudifySource/feature/CFY-446-check-for-none-node-id

CFY-446 dont print None node id's
CFY-72 expose force parameter to execute workflow
Merge pull request #45 from CloudifySource/feature/CFY-72-one-workflow

CFY-72 expose force parameter to execute workflow
flake8
CFY-486 cli now exits with error code 1 when workflow execution fails
Merge pull request #46 from CloudifySource/feature/CFY-486-workflow-fail-exit-code

Workflow failure exit code
Update setup.py
Update setup.py + add test case
fix lint errors
Merge pull request #47 from CloudifySource/feature/CFY-488-pyyaml-version-conflict

Feature/cfy 488 pyyaml version conflict
CFY-443 merge commit + flake8 fix