Make the ReactHN logo link back to /news

This particularly makes sense if we decide to go ahead with hiding the
longer ‘React HN’ homelink text on narrower viewports. Folks can still
tap the icon to go back to /news from one of the other views.

Author: addyosmani

src/App.js

@@ -44,7 +44,7 @@ var App = React.createClass({
     return <div className="App" onClick={this.state.showSettings && this.toggleSettings}>
       <div className="App__wrap">
       <div className="App__header">
-        <img src="img/logo.png" width="16" height="16" alt="" />{' '}
+        <Link to="/news" className="App__homelinkicon"><img src="img/logo.png" width="16" height="16" alt="" /></Link>{' '}
         <Link to="/news" activeClassName="active" className="App__homelink">React HN</Link>{' '}
         <Link to="/newest" activeClassName="active">new</Link>{' | '}
         <Link to="/newcomments" activeClassName="active">comments</Link> {' | '}