Summary:First I searched for special cases that destructor PropTypes:

```
(?s)React\s*=\s*require\('react\-native'\).*(Children|PropTypes)[^\{\}]*\}\s*=\s*React;
```

I split them up manually.

Then I replaced the React = require('react-native') + destructuring pattern...

```
(?s)(const|var)\s+React\s*=\s*require\('react\-native'\)(.*[^\{\}]*\}\s*=\s*)React;
```

...with...

```
$1 React = require('react');
$1 ReactNative = require('react-native')$2ReactNative;
```

I used lint to figure out if I left some unnecessary imports.

Finally I grepped for just

```
React\s*=\s*require\('react\-native'\)
```

to catch any remaining patterns.

Also, `} = React.NativeModules` -> `} = ReactNative.NativeModules`.

Reviewed By: spicyj

Differential Revision: D3158991

fb-gh-sync-id: f97e8e921e193d6ea1a49d8d1bf3f09be7bed5c3
fbshipit-source-id: f97e8e921e193d6ea1a49d8d1bf3f09be7bed5c3