Initializer for react-redux-firebase

Hi!
You have a great library!

Can you help with initializer for `react-redux-firebase` package?
http://react-redux-firebase.com/docs/getting_started

I do this
```
import { reactReduxFirebase, firebaseReducer } from 'react-redux-firebase'
import { compose } from 'redux'
import * as firebase from 'firebase'
import config from 'config'

const firebaseConfig = {
apiKey: config.FIREBASE__API_KEY,
databaseURL: config.FIREBASE__DATABASE_URL,
projectId: config.FIREBASE__PROJECT_ID,
storageBucket: config.FIREBASE__STORAGE_BUCKET,
messagingSenderId: config.FIREBASE__MESSAGING_SENDER_ID,
persistence: true,
}

firebase.initializeApp(firebaseConfig)

const rrfConfig = {
userProfile: 'users',
enableRedirectHandling: false,
}

const reactReduxFirebaseComposer = () =>
compose(reactReduxFirebase(firebase, rrfConfig))

export default {
composers: [reactReduxFirebaseComposer],
reducers: {
firebase: firebaseReducer,
},
}
```

`react-redux-firebase` works, but `redux-thunk` doesn't work any more