AG-420 Improve React implementation

src-trader-dashboard/components/StockTimestampPanel.jsx

@@ -6,41 +6,25 @@ export default class extends Component {
     }
 
     render() {
-        let containerStyle = {
-            display: "inline-block"
-        };
-
-        let priceStyle = {
-            fontSize: "2.6em",
-            fontWeight: "bold",
-            marginRight: 10
-        };
-
         let minorStyle = {
             fontSize: 11,
             color: "#6F6F6F"
         };
 
-        let negativeSwingStyle = {
-            color: "#d14836",
-            marginRight: 5
-        };
-
-        let positiveSwingStyle = {
-            color: "#093",
-            marginRight: 5
-        };
-
-        return (
-            <div>
-                <div id="ref_304466804484872_elt">
-                    May 17, 6:17am GMT-4
-                    <div style={minorStyle}>
-                        <span>NASDAQ</span>
-                        <div>Currency in USD</div>
+        if (!this.props.timestamp) {
+            return null;
+        } else {
+            return (
+                <div>
+                    <div>
+                        {this.props.timestamp}
+                        <div style={minorStyle}>
+                            <span>{this.props.exchangeName}</span>
+                            <div>Currency in USD</div>
+                        </div>
                     </div>
                 </div>
-            </div>
-        );
+            );
+        }
     }
 }