New: Windows Phone theme

src/UI/index.html

@@ -6,7 +6,12 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
     <meta name="mobile-web-app-capable" content="yes"/>
     <meta name="apple-mobile-web-app-capable" content="yes"/>
+
+    <!-- Chrome, Opera, and Firefox OS -->
     <meta name="theme-color" content="#272727"/>
+    <!-- Windows Phone -->
+    <meta name="msapplication-navbutton-color" content="#272727"/>
+
     <meta content="text/html;charset=utf-8" http-equiv="Content-Type"/>
 
     <link href="/Content/bootstrap.css" rel='stylesheet' type='text/css'/>