if rng is not available, other features should still work

Author: dominictarr

rng.js

@@ -1,6 +1,8 @@
 (function() {
   var g = ('undefined' === typeof window ? global : window) || {}
-  var foolBrowserify = require
+  var foolBrowserify = function (r) {
+    try { return require(r) } catch (_) { }
+  }
   _crypto = (
     g.crypto || g.msCrypto || foolBrowserify('crypto')
   )