Upgrade React and Babel
Also, replace UglifyJS with Google Closure Compiler

* wip

* yarn lock

* upgrade deps

* clarify connect

* done

Fixed problems on all builds and clarified config

Rename dist/redux-rest-easy[.min].js to dist/index[.min].js

Increase coverage to 85+%, while fixing small bugs on some edge cases

Fix lack of cache in edge case on getResource used with denormalizer

+ add tests

Fix config validation when using cacheHint

Cache hints will be included in the formatted URLs so that the user has a way to hint the cache on some settings (e.g. accept-language on a request)

* bug(connect):hoist statics variables

* rename it to test

Add new selector `request.getMetadata()` to access payload metadata, along with new action config `metadataNormalizer`

Allow async getToken (e.g. React Native with AsyncStorage, Microsoft AD Authentication)

* All done except invalidate cacheLifetime === Infinity

* added expireAt, tests need fixing

* update snaps

* hasCacheExpired tests done

* tests OK

* feature done, needs tests

* empty paths OK

* requests tests OK

* resources tests OK

* tests done

* docs done

* fixed typos in docs

Allow persistence of resolvers hashes by putting them in the state, so that
libraries like redux-offline can correctly persist all the state, including hashes

`connect` wasn't available in scope in this example.

Fixed runtime error `this.getToken()` is undefined, which happened
when overriding the built-in method

Add Pinesy as a contributor 

Now warning the user when they define an invalid networkHelper in actions config

When normalizer's result is made of one entity, it was not an array.
Fixed it to ensure it is always an array an avoid inconsistency in store

Allow to override built-in and globally provided networkHelpers
on a per-action basis, with a new action configuration

Provide link to documentation when displaying errors

Fix a regeneratorRuntime exception when
running an app which didnt include it

Forward dispatch as-is when it
is not a function

So that it can be used the same
as react-redux's connect