* Upgrade npm to 1.1.21

* uv: Add support for EROFS errors (Ben Noordhuis, Maciej Małecki)

* uv: Add support for EIO and ENOSPC errors (Fedor Indutny)

* windows: Add support for EXDEV errors (Bert Belder)

* http: Fix client memory leaks (isaacs, Vincent Voyer)

* fs: fix file descriptor leak in sync functions (Ben Noordhuis)

* fs: fix ReadStream / WriteStream double close bug (Ben Noordhuis)