* Add aws/core.py function to check for specific AWS error codes
* Use sys.exc_info to get exception object if it isn't passed in
* Allow catching exceptions with is_boto3_error_code
* Replace from_code with is_boto3_error_code
* Return a type that will never be raised to support stricter type comparisons in Python 3+
* Use is_boto3_error_code in aws_eks_cluster
* Add duplicate-except to ignores when using is_boto3_error_code
* Add is_boto3_error_code to module development guideline docs
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