spulec/moto — pull request #117 by kouk (2014-04-02 11:46:51+00:00)
Title: refactor etag calculation to support a correct multipart key etag

This commit support providing the etag as a constructor argument instead of always calculating it from the key value. The benefit is that we can use this to calculate the correct etag for a multipart upload (essentially the md5 of md5's) upon completion.