CFY-646 verification of workers installation now happens before checking whether another execution is already in progress
Merge pull request #49 from cloudify-cosmo/feature/CFY-646-workers-on-deployment-creation

CFY-646 verification of workers installation now happens before checking...
Merge branch 'develop' into feature/CFY-648-workflow-mapping

Conflicts:
	rest-service/manager_rest/blueprints_manager.py