The following PR introduces improved support for Context api and other api's which wrap the root view.

## Context api
Navigation.registerComponent('navigation.playground.ContextScreen', () => (props) => (
  <TitleContext.Provider value={'Title from Provider'}>
    <ContextScreen {...props} />
  </TitleContext.Provider>
), () => ContextScreen);

## Redux
Navigation.registerComponent('navigation.playground.ReduxScreen', () => (props) => (
  <Provider store={reduxStore}>
    <ReduxScreen {...props} />
  </Provider>
), () => ReduxScreen);

## Plain Component - not changed
Navigation.registerComponent('navigation.playground.MyScreen', () => MyScreen);

This PR also upgrades the TypeScript version to 3.2.0 and RN version used in the playground app to 0.57.7

* New Android build flavor - `reactNative57_7`
* Unit test coverage is disabled, for some reason it broke after upgrading to RN 0.57.7

I needed to update the package in order to build the playground project.

* Fixes overlays level - #4145

* Disable overlay unmounts when dismissed

* Fixes e2e

Increase type safety in 3 most important files

Implement Element transition on Android

This commit adds basic support for Element transition to Android.
Currently, only Shared Transition is supported and only when pushing screens.

There are a few caveats you need to be aware of if you intend to use
this feature in its current state:

1. Since elements need to be laid out before the transition can start, Set `waitForRender: true` when pushing the destination screen.
2. Fade animation has to be used when pushing screens with shared elements.

API

```js
options: {
  animations: {
    push: {
      waitForRender: true,
      content: {
        alpha: {
          from: 0,
          to: 1,
          duration: 250
        }
      }
    }
  },
  customTransition: {
    animations: [
    ]
  }
}
```

This commit also upgrades TypeScript to version 2.9.x

* test

* Added jest coverage reporter html for Jenkins

* Migrate to jest to support parallel ios simulator from detox

* When e2e lint only ts or js files

* Remove mocha from deps and decrease from 480000ms to 180000ms

* Support RN 0.55.4

This commit adds support for RN 0.55.4 by introducing version specific build flavors - reactNative51

* Update scripts after introducing build flavors

* Update Android installation instruction on specifying build flavor

* Testing new multi pr job

* Disable unmounts when dismissed

* Migrate to react v16.3 lifecycle & Add backward compatibility for older React versions

* remove yarn.lock

* update api jsdoc

* iniline some properties

* add typedoc

* remove typedoc

* try again with typedoc

* explicit types

* docs

* try handlerbars

* working on docs

* update docs

* html

* removed old md

* trying stuff

* fix lint

* working on docs

* trying with themes

* something works

* trying to use automatically

* working on docs

* docs

* docs

* docw

* auto docs

* rename

* local-docs no cache

* automating

* ts-node

* working on something cool

* temp

* try fix travis

* Revert "try fix travis"

This reverts commit 5bcb54659b.

* removed dead files

* main readme inside docs

* softlink

* softlink

* docs working