adding edge icon for grid

Author: ddavison

java/server/src/org/openqa/grid/images/MicrosoftEdge.png

@@ -96,6 +96,8 @@ public static String consoleIconName(DesiredCapabilities cap, Registry registry)
       ret = BrowserType.CHROME;
     } else if (browserString.startsWith("opera")) {
       ret = BrowserType.OPERA;
+    } else if (browserString.toLowerCase().contains("edge")) {
+      ret = BrowserType.EDGE;
     }
 
     return ret.replace(" ", "_");