2015-02-28 io.js v1.4.2 Release

Notable changes:

* tls: A typo introduced in the TLSWrap changes in
  https://github.com/iojs/io.js/pull/840 only encountered as a bug on
  Windows was not caught by the io.js CI system due to problems with the
  Windows build script and the Windows CI slave configuration, see
  Fixed in https://github.com/iojs/io.js/pull/994 &
  https://github.com/iojs/io.js/pull/1004 (Fedor Indutny)
* npm: Upgrade npm to 2.6.1. See
  https://github.com/npm/npm/blob/master/CHANGELOG.md#v260-2015-02-12
  for details.
* Add new collaborators:
  - Robert Kowalski (@robertkowalski)
  - Christian Vaagland Tellnes (@tellnes)
  - Brian White (@mscdex)