Adding options to the fill filter
Added optional configuration variable for whether the fill should merge the background
Resolving quality config None in graphicsmagick engine
Merge pull request #251 from marciotoshio/master

Resolving quality config None in graphicsmagick engine
Always preserving exif info when saving the original in storage
Made fill transparent a parameter instead of a config setting
Merge pull request #1 from ppatriotis/filter/fill-fix

Made fill transparent a parameter instead of a config setting
Merge pull request #250 from prolificinteractive/filter/fill-fix

Allow Fill filter to fill the background of image
Resets Exif Orientation after reorientating image if RESPECT_ORIENTATION is True
Better tests for the fill filter
Bumping Pillow dependency, fixes #248
Fill filter compatible with other engines
Fix travis CI builds
Use webp in path only when webp is supported
Add path format version to file result storages

Test Plan:
make test
Pillow test_requirement match setup.py
Don't use quality=keep when original image is not a JPEG or when quantization table is invalid
Fixes issues with GraphicsMagick and gif images. Fixes #163.
Correctly call engine's paste method (fixes #273)
Installing pexif from untrusted source