Coreh/uid2 — pull request #2 by pquerna (2013-06-19 19:08:14+00:00)
Title: Improve Character Mapping and use pseudoRandomBytes

* Directly map to 62 url-safe characters instead of going through base64 to get there.
* Use `crypto.pseudoRandomBytes` which is 'good enough' and 'less' blocky than `crypto.randomBytes` (this is due to how OpenSSL works underneath)