log js errors

static/js/oml.js

@@ -1,6 +1,20 @@
 'use strict';
 
 (function() {
+    window.onerror = function(error, url, line, column, errorObj) {
+        if (error == 'TypeError: Attempted to assign to readonly property.') {
+            return;
+        }
+        try {
+            var stack = (errorObj && errorObj.stack) || "(no stack trace available)";
+
+            !/^resource:/.test(url) && oml.api.logError({
+                text: error + "\n\n" + stack,
+                url: document.location.pathname + ' at ' + url,
+                line: line
+            });
+        } catch(e) {}
+    };
 
     var animationInterval,
         enableDebugMode = getLocalStorage('oml.enableDebugMode'),