Add a Playground for the UI Components (#4301)

* Playground // WIP

* Linting

* Add Examples with code

* CSS Linting

* Linting

* Add Connected Currency Symbol

* 2015-2017

* 2015-2017

* 2015-2017

* 2015-2017

* 2015-2017

* 2015-2017

* 2015-2017

* Added `renderSymbol` tests

* PR grumbles

* Add Eth and Btc QRCode examples

* 2015-2017

* Add tests for playground

* Fixing tests

js/src/views/Application/application.js

@@ -57,6 +57,14 @@ class Application extends Component {
     const [root] = (window.location.hash || '').replace('#/', '').split('/');
     const isMinimized = root === 'app' || root === 'web';
 
+    if (process.env.NODE_ENV !== 'production' && root === 'playground') {
+      return (
+        <div>
+          { this.props.children }
+        </div>
+      );
+    }
+
     if (inFrame) {
       return (
         <FrameError />