CFY-203 added delete deployment REST API
CFY-203 fixed a bug in es_storage_manager delete_execution; delete_deployment now uses the updated execution status; improved unit and integration tests for delete deployment
CFY-203 fixed integration test for deployment delete; fixed cancel_execution in testenv
CFY-203 tiny fix to cancel_execution call in testenv
Merge pull request #25 from cloudify-cosmo/feature/CFY-203-add-delete-deployment-REST-API

CFY-203 added delete deployment REST API