CLOUD-263 fix stack and cluster name pattern
Merge pull request #307 from sequenceiq/stack-cluster-pattern

CLOUD-263 fix stack and cluster name pattern
CLOUD-156 database name environment variable was not used
CLOUD-156 SNS delete complete handler
CLOUD-156 db env variable defaults
Merge pull request #308 from sequenceiq/aws-delete-handling

Aws delete complete handler
updated AWS instructions

The AWS Console instructions may just have been out of date due to changes on the console in the past few months, so those were updated. The AWS role script requires that the user have the AWS CLI installed and on the path.
Merge pull request #311 from alph486/patch-1

updated AWS instructions
ssh public keys in OpenSSH format are required when creating credentials
Merge pull request #312 from sequenceiq/doc-update

updated docs
CLOUD-252 implemented skeleton of template system
CLOUD-252 some review item fixed
CLOUD-252 more review item fix
CLOUD-252 fixed executorservice
CLOUD-252 some change on resource handling
CLOUD-252 fixed review items