Add icons for iOS/Android

Author: jcraigk

app/javascript/images/logo-square-180.png

@@ -2,8 +2,10 @@ doctype html
 html
   head
     title = @meta[:title] || App.app_name
-    link rel="icon" href="/favicon.ico"
     link rel="canonical" href="#{request.base_url}#{request.path}"
+    link rel="icon" type="image/x-icon" href="/favicon.ico"
+    link rel="icon" type="image/png" sizes="192x192" href=image_pack_url("static/images/logo-square-192.png")
+    link rel="apple-touch-icon" href=image_pack_url("static/images/logo-square-180.png")
     = auto_discovery_link_tag :rss, "/feeds/rss", title: "#{App.app_name} Updates"
     = javascript_pack_tag "application"
     = stylesheet_pack_tag "application"