npm: Upgrade to v1.2.11
2013.02.15, Version 0.8.20 (Stable)

* npm: Upgrade to v1.2.11

* http: Do not let Agent hand out destroyed sockets (isaacs)

* http: Raise hangup error on destroyed socket write (isaacs)

* http: protect against response splitting attacks (Bert Belder)
Merge branch 'v0.8.20-release' into v0.8
Now working on v0.8.21
blog: Release v0.8.20