2015-08-18 io.js v3.1.0 Release

Notable changes:

* buffer: Fixed a couple large memory leaks (Ben Noordhuis)
https://github.com/nodejs/node/pull/2352.
* crypto:
  - Fixed a couple of minor memory leaks (Karl Skomski)
https://github.com/nodejs/node/pull/2375.
  - Signing now checks for OpenSSL errors (P.S.V.R)
https://github.com/nodejs/node/pull/2342. **Note that this may expose
previously hidden errors in user code.**
* intl: Intl using small-icu is now enabled by default in builds
(Steven R. Loomis) https://github.com/nodejs/node/pull/2264.
  - `String#normalize()` can now be used for unicode
normalization.
  - The `Intl` object and various `String` and `Number` methods are
present, but only support the English locale.
  - For support of all locales, node must be built with full-icu.
* tls: Fixed tls throughput being much lower after an incorrect merge
(Fedor Indutny) https://github.com/nodejs/node/pull/2381.
* tools: The v8 tick processor now comes bundled with node (Matt
Loring) https://github.com/nod...