LICENSE for quotemeta, add comment about duplication

LICENSE.txt

@@ -288,6 +288,7 @@ shell-quote: https://github.com/substack/node-shell-quote
 deep-equal: https://github.com/substack/node-deep-equal
 editor: https://github.com/substack/node-editor
 minimist: https://github.com/substack/node-minimist
+quotemeta: https://github.com/substack/quotemeta
 ----------
 
 Copyright 2010, 2011, 2012, 2013 James Halliday (mail@substack.net)

packages/mongo-livedata/mongo_driver.js

@@ -228,6 +228,7 @@ var pendingSequences = [];
 
 // Like Perl's quotemeta: quotes all regexp metacharacters. See
 //   https://github.com/substack/quotemeta/blob/master/index.js
+// XXX this is duplicated with accounts_server.js
 var quotemeta = function (str) {
     return String(str).replace(/(\W)/g, '\\$1');
 };