Jaisen Mathai 87e0420fba
Make Pillow optional due to external dependencies (#326)
Fixes #325.

`Pillow` has a number of external dependencies needed for installation. Since most media files are detected correctly with `imghdr` and `Pillow` is used as a fallback we can make it optional.

`Pillow` support was added in #320 to fix #281.
2019-07-14 17:36:09 -07:00
..