Add support for EC2 IAM roles, via a config option 'token' which adds an
x-amz-security-token header to requests.
Fix a bug - LWP actually (sometimes) sends timeout as X-Died header (without changing HTTP status to 500). Now handle this.
Version 0.955 released
Merge branch 'iam-role-support' of https://github.com/jeremyd2019/mt-aws-glacier into jeremyd2019-iam-role-support
Merge branch 'master' into development