2015-05-17 io.js v1.8.2 Release

Maintenance release

Notable Changes:

* crypto: significantly reduced memory usage for TLS (Fedor Indutny &
  Сковорода Никита Андреевич) #1529
* npm: Upgrade npm to 2.9.0. See the v2.8.4 and v2.9.0 release notes for
  details.