[TESTS]: wrote a full redux-saga example w/ middleware

[toranb]

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[toranb]

@cafreeman I wrote a simple patch that helps prove redux-saga is supported (along w/ your custom middleware setup method). I realize it doesn't include any proof that the store is passed like redux-observable needs but I figure we could patch this in w/ a dual middleware (like you showed in your example).

This look good to you? It's not a "running test" just yet as I planned to merge this (after you look it over) and then you can rebase/ rename it to zmiddleware-test.js and watch it go green :)

[cafreeman]

@toranb this looks great! Let's merge it!