* Path is an optional property of instance profile cloudformation resource http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-iam-instanceprofile.html * Path is also optional for iam role clouformation resources Based on http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-iam-role.html * Use `properities.get` with a default instead of doing default handling myself