build: Add some required modules for node

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+# safe-regex
+
+detect potentially
+[catastrophic](http://regular-expressions.mobi/catastrophic.html)
+[exponential-time](http://perlgeek.de/blog-en/perl-tips/in-search-of-an-exponetial-regexp.html)
+regular expressions by limiting the
+[star height](https://en.wikipedia.org/wiki/Star_height) to 1
+
+WARNING: This module merely *seems* to work given all the catastrophic regular
+expressions I could find scouring the internet, but I don't have enough of a
+background in automata to be absolutely sure that this module will catch all
+exponential-time cases.
+
+[![browser support](https://ci.testling.com/substack/safe-regex.png)](https://ci.testling.com/substack/safe-regex)
+
+[![build status](https://secure.travis-ci.org/substack/safe-regex.png)](http://travis-ci.org/substack/safe-regex)
+
+# example
+
+``` js
+var safe = require('safe-regex');
+var regex = process.argv.slice(2).join(' ');
+console.log(safe(regex));
+```
+
+```
+$ node safe.js '(x+x+)+y'
+false
+$ node safe.js '(beep|boop)*'
+true
+$ node safe.js '(a+){10}'
+false
+$ node safe.js '\blocation\s*:[^:\n]+\b(Oakland|San Francisco)\b'
+true
+```
+
+# methods
+
+``` js
+var safe = require('safe-regex')
+```
+
+## var ok = safe(re, opts={})
+
+Return a boolean `ok` whether or not the regex `re` is safe and not possibly
+catastrophic.
+
+`re` can be a `RegExp` object or just a string.
+
+If the `re` is a string and is an invalid regex, returns `false`.
+
+* `opts.limit` - maximum number of allowed repetitions in the entire regex.
+Default: `25`.
+
+# install
+
+With [npm](https://npmjs.org) do:
+
+```
+npm install safe-regex
+```
+
+# license
+
+MIT