Problem
Currently, if the user wants to use RxJS or any other reactive library except light-observable, he needs to use from and its analogs in every epic. stapp-rxjs package solves this problem partially but is not convinient.

Solution
Libraries like redux-observable and recompose try to solve this problem by exposing a function (e.g.: setObservableConfig in recompose) that sets all needed transformations globally.

Todo:

1. Create and expose a method to set transformations globally.
2. Add a boolean field to module interface, that will, if set to true, force stapp to ignore global config and provide that module the native observable.
3. Add predefined config to stapp-rxjs