Explanatory comments and lint

src/components/stage/stage.jsx

@@ -101,6 +101,7 @@ StageComponent.propTypes = {
     isColorPicking: PropTypes.bool,
     isFullScreen: PropTypes.bool.isRequired,
     onDeactivateColorPicker: PropTypes.func,
+    onDoubleClick: PropTypes.func,
     onQuestionAnswered: PropTypes.func,
     question: PropTypes.string,
     stageSize: PropTypes.oneOf(Object.keys(STAGE_DISPLAY_SIZES)).isRequired,

src/containers/dom-element-renderer.jsx

@@ -7,6 +7,9 @@ import React from 'react';
  * rendered by React. It's up to the containing component
  * to retain a reference to the element prop, or else it
  * will be garbage collected after unmounting.
+ *
+ * Props passed to the DOMElementRenderer will be set on the
+ * DOM element like it's a normal component.
  */
 class DOMElementRenderer extends React.Component {
     constructor (props) {
@@ -23,17 +26,19 @@ class DOMElementRenderer extends React.Component {
         this.container = c;
     }
     render () {
+        // Apply props to the DOM element, so its attributes
+        // are updated as if it were a normal component.
         // Look at me, I'm the React now!
         Object.assign(
             this.props.domElement,
             omit(this.props, ['domElement', 'children'])
-        )
+        );
         return <div ref={this.setContainer} />;
     }
 }
 
 DOMElementRenderer.propTypes = {
     domElement: PropTypes.instanceOf(Element).isRequired
-}
+};
 
 export default DOMElementRenderer;