Intercom package.

### Settings

```
{
  "public": {

    "intercom": {
      "appId": "123foo"
    }

  },
  
  "intercom": {
    "accessToken": "456bar"
  }
}
```

Requires installing the [react-intercom](https://github.com/nhagen/react-intercom) package (`npm install --save react-intercom`).