add README
change for observed GetQueueAttributesResponse xml

I haven't used sqs that long, maybe the format has changed. When I use sqs.go to dump the raw xml, I see:

<?xml version="1.0"?><GetQueueAttributesResponse xmlns="http://queue.amazonaws.com/doc/2011-10-01/"><GetQueueAttributesResult><Attribute><Name>QueueArn</Name><Value>arn:aws:sqs:blahblah</Value></Attribute>...

i.e. the Name and Value elements are direct children of Attribute
Merge pull request #1 from bradclawsie/master

change for observed GetQueueAttributesResponse xml
Go fmt / getting rid of extra whitespace.
Splitting out a method for deleting a message purely on the ReceiptHandle.