add node_modules

node_modules/nedb/lib/customUtils.js

@@ -0,0 +1,23 @@
+var crypto = require('crypto')
+  , fs = require('fs')
+  ;
+
+/**
+ * Return a random alphanumerical string of length len
+ * There is a very small probability (less than 1/1,000,000) for the length to be less than len
+ * (il the base64 conversion yields too many pluses and slashes) but
+ * that's not an issue here
+ * The probability of a collision is extremely small (need 3*10^12 documents to have one chance in a million of a collision)
+ * See http://en.wikipedia.org/wiki/Birthday_problem
+ */
+function uid (len) {
+  return crypto.randomBytes(Math.ceil(Math.max(8, len * 2)))
+    .toString('base64')
+    .replace(/[+\/]/g, '')
+    .slice(0, len);
+}
+
+
+// Interface
+module.exports.uid = uid;
+