0.1.9

Fixed bug where signatures with '+' in weren't being properly encoded.

0.1.8

• Add SignS3View.private flag to determine whether we're uploading
  private resources. If so, return the signed GET url so the media can
  be displayed immediately on upload.

0.1.7

• Don't use amz headers for signature calculation if they aren't present.

0.1.6

• Add webp, svg, and pdf mime types.
• Allow amz acl to be configurable in S3Upload.js

0.1.5

• Update base64.encodestring() to encodebytes().

0.1.4

• Added unicode support / python3 compatibility