More gracefully handle error objects with a non-number 'code' attribute.
Add 'Timestamp' header to all successful requests.
Fix typo in comment
Remove extraneous argument to Math.floor
Merge pull request #362 from mozilla/rfk/timestamp-header

Add 'Timestamp' header to all successful requests.
Merge pull request #287 from mozilla/make-boom-not-go-boom

Non-numeric "code" properties on error objects?