Not updated for wagtail-2.0 and will uninstall latest versions

[rwestera]

This package is not compatible with wagtail-2.0.
Instead of saying it is not compatible, when you use pip install on it, it will blindly downgrade wagtail, django, and other up-to-date packages.

[jpadilla]

@rwestera thanks for the heads up, we'll be updating this library to support the latest wagtail release.