on Android -->
  <meta name="mobile-web-app-capable" content="yes">
  <meta name="application-name" content="PSK">
  <link rel="icon" sizes="192x192" href="images/touch/chrome-touch-icon-192x192.png">

  <!-- Add to homescreen for Safari on iOS -->
  <meta name="apple-mobile-web-app-capable" content="yes">
  <meta name="apple-mobile-web-app-status-bar-style" content="black">
  <meta name="apple-mobile-web-app-title" content="Polymer Starter Kit">
  <link rel="apple-touch-icon" href="images/touch/apple-touch