[WEBP] add webp format detection (no filename extension case)
Fixed a minor bug with webp format and included a conf to preserve exif info in images.
Release 3.11.1
Merge pull request #194 from dhardy92/feature_Add_WEBP_Detection

[WEBP] add webp format detection (no filename extension case)
Mongo sleep
Fixing thumbor to work with the master branch of pillow.
Fixed issue with StringIO when reading images from PIL
Forcing Pillow with new version to be used (Release 2.1.0)
Release 3.12.0