Removed call to next() from deleteMessage() and changeMessageVisibility().  Under high load situations this can cause the deleteMessage() to be delayed siginfiicantly as new messages stream in. This can cause the visibility to expire from the receive causing you to process a message again before the deleteMessage() completes.  Updated docs to show expectation around calling next() manually.
Fix typos in tests
Changed javascript file
Update package.json
add AttributeNames-All to SQS receiveMessage call so we get metadata like SentTimestamp
Merge pull request #2 from PushSpring/master

Remove automatic call to next() in deleteMessage() and changeMessageVisibility()