2015-07-09 io.js v2.3.4 Release

Notable changes

* openssl: Upgrade to 1.0.2d, fixes CVE-2015-1793 (Alternate Chains
Certificate Forgery).
* npm: Upgraded to v2.12.1, release notes can be found in
https://github.com/npm/npm/releases/tag/v2.12.0 and
https://github.com/npm/npm/releases/tag/v2.12.1 (Kat Marchán)
https://github.com/nodejs/io.js/pull/2112.