Fix 'NaN' txid for RPC when using IE

www/common/sframe-boot2.js

@@ -13,6 +13,11 @@ define([
         };
     }
 
+    // RPC breaks if you don't support Number.MAX_SAFE_INTEGER
+    if (Number && !Number.MAX_SAFE_INTEGER) {
+        Number.MAX_SAFE_INTEGER = 9007199254740991;
+    }
+
     var mkFakeStore = function () {
         var fakeStorage = {
             getItem: function (k) { return fakeStorage[k]; },