2016-01-20, Version 5.5.0 (Stable)

Notable changes:

* events: make sure console functions exist (Dave) https://github.com/nodejs/node/pull/4479
* fs: add autoClose option to fs.createWriteStream (Saquib) https://github.com/nodejs/node/pull/3679
* http: improves expect header handling (Daniel Sellers) https://github.com/nodejs/node/pull/4501
* node: allow preload modules with -i (Evan Lucas) https://github.com/nodejs/node/pull/4696
* v8,src: expose statistics about heap spaces (`v8.getHeapSpaceStatistics()`) (Ben Ripkens) https://github.com/nodejs/node/pull/4463
* Minor performance improvements:
  - lib: Use arrow functions instead of bind where possible (Minwoo Jung) https://github.com/nodejs/node/pull/3622
  - module: cache stat() results more aggressively (Ben Noordhuis) https://github.com/nodejs/node/pull/4575
  - querystring: improve parse() performance (Brian White) https://github.com/nodejs/node/pull/4675

PR-URL: https://github.com/nodejs/node/pull/4742