publish a transpiled RN version

[colmbrady]

Seeing as ReactXP is targetting browser and native, I think it makes sense to ship transpiled module on native also.

facebook/react-native#7850
https://stackoverflow.com/questions/37277215/transpile-react-native-module-to-es5-before-publishing-to-npm

Need to figure out whether this has implications on an upgrade path. I dont believe it does.

[colmbrady]

facebook/react-native#7850
facebook/react-native#10966

It seems the general wisdom is that only transpiled modules should be published, however there is some issues with React Native packager which may mean that source maps dont get applied. Here is more info:

https://gist.github.com/ide/e7b9181984933ebb0755c7367a32e7e8