updated links to favicons

Author: JonRowe

_layouts/default.html

@@ -5,6 +5,8 @@
     <meta charset="utf-8">
     <meta http-equiv="X-UA-Compatible" content="chrome=1">
     <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
+    <link rel="shortcut icon"         href="/favicon.ico" />
+    <link rel="icon" type="image/png" href="/favicon.png" />
     <link rel="stylesheet" href="/styles/default.css">
     <link rel="stylesheet" href="/styles/bootstrap.css">
     <!--[if lt IE 9]>