mattvox / react-css-burger / 21 / 1

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master: 84%

Pull #3

travis-ci

document is not defined at gatsby build

I'm using `react-css-burger` in my project, but I get the following error when run `gatsby build`. gatsby runs on Node when creating production and node don't know document.
I fixed this on my local project, but please Accept this 'cause I can't deploy my project anywhere! 

```
failed Building static HTML for pages - 3.524s
7:33:26 AM: error "document" is not available during server side rendering.
7:33:26 AM: 
7:33:26 AM:   34 | 
7:33:26 AM:   35 | var Burger = function Burger(props) {
7:33:26 AM: > 36 |   var root = document.documentElement;
7:33:26 AM:      | ^
7:33:26 AM:   37 |   var active = props.active,
7:33:26 AM:   38 |       onClick = props.onClick,
7:33:26 AM:   39 |       burger = props.burger,
7:33:26 AM: 
7:33:26 AM:   WebpackError: ReferenceError: document is not defined
7:33:26 AM:   
7:33:26 AM:   - index.es.js:36 
7:33:26 AM:     node_modules/react-css-burger/dist/index.es.js:36:1
7:33:26 AM:   
7:33:26 AM: 
7:33:26 AM: not finished Generating image thumbnails - 28.441s
```

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