Adding other proxy middlewares

[percyhanna]

See https://github.com/tshaddix/react-chrome-redux/issues/163 for a bit of context (from react-chrome-redux).

The main limitation with react-chrome-redux is the requirement to separate local actions from background/aliased actions.

electron-redux seems like it would be easier to morph to fit my needs (and, I also need an Electron proxy store, so that's another benefit). electron-redux seems to be nicely architected to allow for the introduction of other middleware(s) to handle other environments like Chrome. The concept of a proxied store is obviously one that many people feel is useful, and I wonder if a more generic module could be created that includes middleware providers for Chrome, Electron, and potentially other environments as well.

I'm likely going to mimic electron-redux's code to create a Chrome store proxy à-la react-chrome-redux, but with the ability to separate local and aliased actions.

For now I could just create a separate module that mimics electron-redux's API, and it would provide forwardToRenderer and forwardToMain alternatives. I'm hoping that only replacing those two functions would be the only changes needed to support a proxy store in Chrome extensions.

So I suppose the question would be if there's the possibility of eventually moving to a more generic module (e.g. redux-proxy-store) that could support any number of middleware(s).

Thanks for the great work on electron-redux.