Attempting to set authenticated-read as a string.
Adjusting YAML string formatting.
Sending x-amz-grant-read-acp header as explained in http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPUT.html
Adjusting s3.put (#<RightAws::AwsError: InvalidArgument: Argument format not recognized>)
Merge pull request #5 from copious/bucket_permission_fix

Default to 'authenticated-read' for permissions