Fix for meteor in IE8 (moment#2308)

Author: ichernev

meteor/export.js

@@ -1,3 +1,6 @@
 // moment.js makes `moment` global on the window (or global) object, while Meteor expects a file-scoped global variable
 moment = this.moment;
-delete this.moment;
+try {
+    delete this.moment;
+} catch (e) {
+}