2013.10.18, Version 0.10.21 (Stable)

* uv: Upgrade to v0.10.18

* crypto: clear errors from verify failure (Timothy J Fontaine)

* dtrace: interpret two byte strings (Dave Pacheco)

* fs: fix fs.truncate() file content zeroing bug (Ben Noordhuis)

* http: provide backpressure for pipeline flood (isaacs)

* tls: fix premature connection termination (Ben Noordhuis)