Merge pull request #33 from wakeless/mgall/allow-left-button-to-control-its-own-destiny

Allow headerLeft components to control their own rendering

packages/stack/src/views/Header/Header.js

@@ -217,6 +217,7 @@ class Header extends React.PureComponent {
         titleStyle={options.headerBackTitleStyle}
         layoutPreset={this.props.layoutPreset}
         width={width}
+        scene={props.scene}
       />
     );
   };