[AWS|IAM] Use signature version 4
[AWS|ELB] Use Signature v4
[AWS|ELB] Update list of regions the mocks allow
[AWS|RDS] Use Signature v4
[AWS|RDS] update list of regions accepted by mocks
[AWS|Cloudwatch] Use Signature v4
[AWS|Cloudwatch] Update list of regions allowed by the mock
[AWS|Autoscaling] Use Signature v4
[AWS|Autoscaling] Update list of regions accepted by the mocks
[AWS|Elasticache] Use Signature v4
[AWS|STS] Use Signature v4
[AWS|SNS] Use Signature v4
[AWS|SQS] Use Signature v4
[AWS|SQS] Update list of regions allowed by mocks
[AWS|CloudFormation] Use Signature v4
[AWS|EMR| Use Signature v4
[AWS|Elasticbeanstalk] Use Signature v4
[AWS|Signaturev4] canonicalize . and .. in path
[AWS|Storage] Need to check for nil headers
[AWS|Signature] fix handling of repeated slashes