2015-11-17, Version 5.1.0 (Stable)

Notable changes:

* **child_process**: child.send() now properly returns a boolean like
the docs suggest (Rich Trott) nodejs#3577.
* **http_parser**: update http-parser to 2.6.0 from 2.5.0 (James M
Snell) nodejs#3569.
  - Now supports the following HTTP methods: `LINK`, `UNLINK`, `BIND`,
`REBIND`, `UNBIND`.
  - Also added ACL and IPv6 Zone ID support.
* **npm**: upgrade npm to 3.3.12 from v3.3.6 (Rebecca Turner)
nodejs#3685.
  - See the release notes for
    https://github.com/npm/npm/releases/tag/v3.3.7,
    https://github.com/npm/npm/releases/tag/v3.3.8,
    https://github.com/npm/npm/releases/tag/v3.3.9,
    https://github.com/npm/npm/releases/tag/v3.3.10,
    https://github.com/npm/npm/releases/tag/v3.3.11, and
    https://github.com/npm/npm/releases/tag/v3.3.12 for more details.
* **repl**: The REPL no longer crashes if the persistent history file
cannot be opened (Evan Lucas) nodejs#3630.

PR-URL: nodejs#3736