Support including in rollup projects without extra plugins/hacks

[rjcorwin]

What is the current behavior?

Doing import { createStore } from 'redux' in a rollup project results in console error in browserredux.js:615 Uncaught ReferenceError: process is not defined.

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via https://jsfiddle.net or similar.

https://polymer-with-redux.glitch.me/

What is the expected behavior?

To not crash and not have to do any of the work arounds described in this rollup issue because sometimes we're in a situation where we can't / don't want to mess with rollup as is the case in a Polymer CLI project (related issue)

Which versions of Redux, and which browser and OS are affected by this issue? Did this work in previous versions of Redux?
Redux 4.0.0. I'm just testing in latest Chrome but I'm sure we'll see this everywhere. I'm not sure if it worked in previous versions of Redux.

[timdorr]

Dupe of #2907