Alert users when their WebView is too old to work properly.

www/js/platform.js

@@ -13,6 +13,12 @@ var openBrowser = function (url) {
 function initCordova() {
     platform_type = "cordova";
 
+    try {
+        eval('"use strict"; class foo {}');
+    } catch (e) {
+        alert("Your device's webview is out of date and won't work with this app.  Please update it.");
+    }
+
     // Handle back button to close things
     document.addEventListener("backbutton", function (event) {
         router.navigate("/home");

www/pages/editor.html

@@ -31,6 +31,10 @@ file, You can obtain one at http://mozilla.org/MPL/2.0/.
         background-color: white;
         border: none;
         border-radius: 0px;
+        /* Following lines are from Framework7 .elevation-2 */
+        -webkit-box-shadow: 0px 3px 1px -2px rgba(0,0,0,.2),0px 2px 2px 0px rgba(0,0,0,.14),0px 1px 5px 0px rgba(0,0,0,.12);
+        box-shadow: 0px 3px 1px -2px rgba(0,0,0,.2),0px 2px 2px 0px rgba(0,0,0,.14),0px 1px 5px 0px rgba(0,0,0,.12);
+        /* end Framework7 code */
     }
 </style>