Code splitting

[SethDavenport]

Maybe we can use this to improve the experience for lazy loading epics. See discussion here: angular-redux/store#305, and the vanilla-redux recipe here: https://github.com/redux-observable/redux-observable/blob/bc26db5d47d65f57a9d52736a6b2dde102f8733e/docs/recipes/AddingNewEpicsAsynchronously.md

[SethDavenport]

This might be a handy playground for some of these ideas: https://github.com/SethDavenport/zoo