Highlighting doesn't work when rendering through server

It returns just `code` element. By the looks of it, `CodeComponent` does just

``` javascript
this.refs.code.getDOMNode().innerHTML = hljs.highlight(this.props.language, this.props.code).value;
```

on `componentDidMount` and `componentDidUpdate`.

There has to be some better way to deal with this.

Start by reading the CodeComponent and its componentDidMount and componentDidUpdate paths mentioned in the issue, then trace how it is rendered on the server. Done means server rendering produces the highlighted code content instead of only a code element, with the client behavior still working.

Written by the indexing model from the issue text.