Downgrade React Native version to 0.25
Downgrade React Native version to 0.25

Looks like https://github.com/facebook/react-native/issues/7941 breaks dragging,
so fingers crossed that it gets fixed. If not, I'll have to find some
workaround.

alangpierce/LambdaCalculusPlayground,alangpierce/LambdaCalculusPlayground,alangpierce/LambdaCalculusPlayground