CLOUD-148 added azure rollback
CLOUD-148 failure handling under the provision
CLOUD-148 fixed exception message in removenode
CLOUD-148 fixed exception handling in rollback logic
CLOUD-148 removde unused field
CLOUD-225 entity annotated with name
CLOUD-225 enAdded stack id to the event
Merge pull request #281 from sequenceiq/events

lgtm
CLOUD-225 failed application start fix
Merge pull request #282 from sequenceiq/event-fail

CLOUD-225 failed application start fix
Merge pull request #278 from sequenceiq/rollback

Rollback
CLOUD-227 Implemented basic usage retrieval logic
CLOUD-228 partially implemented usage generation logic