Devin Abbott f4a8efa452 Add react-native-web-player to core components docs
Summary:
This PR adds the interactive [React Native Web Player](http://dabbott.github.io/react-native-web-player/) to the docs. The web player is an embeddable iframe which runs React Native code using components from [react-native-web](https://github.com/necolas/react-native-web). For now, it's primarily for educational purposes, since only the basic components are implemented.

Some details:
- The iframe is loaded from MaxCDN using rawgit, locked down to a git tag.
- Asset paths (i.e. images) are resolved relative to `//facebook.github.io/react-native/`
- When viewed on mobile, it falls back to the syntax-highlighted code blocks.

The WebPlayer can be inserted into markdown by using the fences:

```
```ReactNativeWebPlayer

import ...

AppRegistry.registerComponent ...

`` `
```

![screen shot 2016-06-22 at 12 46 50 pm](https://cloud.githubusercontent.com/assets/1198882/16281068/7056804e-3877-11e6-82f7-ece245690548.png)

I didn't actually add the WebPlayer to any docs pages in this PR. That we c
Closes https://github.com/facebook/react-native/pull/8328

Differential Revision: D3471527

Pulled By: lacker

fbshipit-source-id: 704da41cd77e08c7e2bc820557a74d36e88e8eb7
2016-06-22 14:13:22 -07:00
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