update icon buttons, fix weird utils error

Author: kyleturco

docs/app/Examples/elements/Button/Groups/ButtonButtonsExample.js

@@ -5,9 +5,9 @@ export default class ButtonButtonsExample extends Component {
   render() {
     return (
       <Buttons>
-        <Button class='primary'>One</Button>
-        <Button class='primary'>Two</Button>
-        <Button class='primary'>Three</Button>
+        <Button>One</Button>
+        <Button>Two</Button>
+        <Button>Three</Button>
       </Buttons>
     );
   }

docs/app/Examples/elements/Button/Groups/ButtonIconButtonsExample.js

@@ -5,9 +5,15 @@ export default class ButtonIconButtonsExample extends Component {
   render() {
     return (
       <Buttons>
-        <Button class='primary'>One</Button>
-        <Button class='primary'>Two</Button>
-        <Button class='primary'>Three</Button>
+        <Button className='icon'>
+          <i className='save icon' />
+        </Button>
+        <Button className='icon'>
+          <i className='delete icon' />
+        </Button>
+        <Button className='icon'>
+          <i className='edit icon' />
+        </Button>
       </Buttons>
     );
   }

test/utils/React-util.js

@@ -19,7 +19,7 @@ import {
 /**
  * Render a ReactElement and use helpful test utility methods against it.
  * @param {ReactElement} reactElement The element to render.
- * @returns {RenderedTree}
+ * @returns {RenderedTree} The return
  */
 class RenderedTree {
   constructor(reactElement) {