Fix so that Google Chrome can download pdf documents and avoid displaying them inside the browser, which appears to fail. See http://stackoverflow.com/questions/8411031/aws-s3-file-downloads-are-not-working-in-chrome-works-fine-with-ie-mozilla-sa for background.
Merge branch 'master' into Frantic
Added Cache-Control: No-cache header to file downloads. Proper signing of download requests with extra response headers.
Merge branch 'master' into Frantic