Release proposal: v5.1.0 #3700

The usual weekly-ish. Proposed for monday/tuedsay of next week.

• [59cd28114d] - Add missing va_end before return (Ömer Fadıl Usta) #3565
• [b663d2bbb5] - async_wrap: call callback in destructor (Trevor Norris) #3461
• [eccbec99ea] - async_wrap: new instances get uid (Trevor Norris) #3461
• [5d34c81a5c] - async_wrap: allow some hooks to be optional (Trevor Norris) #3461
• [56673693cd] - buffer: neuter external nullptr buffers (Fedor Indutny) #3624
• [8f5a2550a7] - build: omit -gline-tables-only for --enable-asan (Ben Noordhuis) #3680
• [e888471a11] - child_process: don't fork bomb ourselves from -e (Ben Noordhuis) #3575
• [d64a56cba5] - cluster: remove handles when disconnecting worker (Ben Noordhuis) #3677
• [b48dbf9fce] - deps: upgrade npm to 3.3.12 (Rebecca Turner) #3685
• [7caeb14e11] - (SEMVER-MINOR) deps: update http-parser to 2.6.0 (James M Snell) #3569
• [08e0de59fa] - deps: upgrade npm to 3.3.10 (Rebecca Turner) #3599
• [e5b9109d12] - doc: add thealphanerd to collaborators (Myles Borins) #3723
• [a05a0b47e3] - doc: add saghul as a collaborator (Saúl Ibarra Corretgé)
• [b14d9c5f16] - doc: add method links in events.markdown (Alejandro Oviedo) #3187
• [44f779b112] - doc: add caveats of algs and key size in crypto (Shigeki Ohtsu) #3479
• [a0db5fb355] - doc: stdout/stderr can block when directed to file (Ben Noordhuis) #3170
• [409f29972e] - doc: rename iojs-* groups to nodejs-* (Steven R. Loomis) #3634
• [801866280e] - doc: fix wrong date and known issue in changelog.md (James M Snell) #3650
• [325c4c7af5] - doc: fix function param order in assert doc (David Woods) #3533
• [045e04e531] - doc: typo fix in readme.md (Sam P Gallagher-Bishop) #3649
• [7fd8f1371e] - doc: add note about timeout delay > TIMEOUT_MAX (Guilherme Souza) #3512
• [7d0b589644] - doc: fix crypto spkac function descriptions (Jason Gerfen) #3614
• [efa19bdcb5] - doc: add final full stop in CONTRIBUTING.md (Emily Aviva Kapor-Mater) #3576
• [90723afe32] - doc: made code spans more visible in the API docs (phijohns) #3573
• [73e40f0327] - docs: fs - change links to buffer encoding to Buffer class anchor (fansworld-claudio) #2796
• [7a84fa6c60] - docs: fs - remove encoding list and link to buffer (fansworld-claudio)
• [c96400c572] - gitignore: don't ignore 'debug' in deps/npm (Rebecca Turner) #3599
• [a7f28a098e] - http: remove unneeded cb check from setTimeout() (Ashok Suthar) #3631
• [d2b5dcb2de] - lib: return boolean from child.send() (Rich Trott) #3577
• [89285db128] - module: remove unnecessary JSON.stringify (Andres Suarez) #3578
• [75dbafc3f8] - repl: To exit, press ^C again or type .exit. (Hemanth.HM) #3368
• [5073da0481] - repl: don't crash if cannot open history file (Evan Lucas) #3630
• [2498e29344] - src: Revert "nix stdin _readableState.reading" (Roman Reiss) #3490
• [65cd03cda6] - src: wrap source before doing syntax check (Evan Lucas) #3587
• [d72bb1e96a] - _Revert_ "src: fix stuck debugger process" (Ben Noordhuis) #3585
• [81997840f2] - test: fix test-module-loading-error for musl (Hugues Malphettes) #3657
• [9cdceac782] - test: use really invalid hostname (Sakthipriyan Vairamani) #3711
• [f3594e77b2] - test: fix test-net-persistent-keepalive for AIX (Imran Iqbal) #3646
• [81522480f1] - test: more regression tests for minDHSize option (Ben Noordhuis) #3629
• [935b97769e] - test: add regression test for 512 bits DH key (Ben Noordhuis) #3629
• [e302c33bb0] - test: mark http-pipeline-flood flaky (Rich Trott) #3616
• [5977963bce] - test: remove flaky designation from ls-no-sslv3 (Rich Trott) #3620
• [1e98d90db8] - test: add regression test for --debug-brk -e 0 (Ben Noordhuis) #3585
• [e40d28283a] - tools: update npm test tooling for 3.3.10+ (Rebecca Turner) #3599
• [cbd358ce33] - tools: fix gyp to work on MacOSX without XCode (Shigeki Ohtsu) iojs/io.js#1325
• [3137e46cb8] - tools: update gyp to b3cef02 (Imran Iqbal) #3487
• [9a45c21e6c] - util: use regexp instead of str.replace().join() (qinjia) #3689

cc @nodejs/release if anyone wants do do this one, otherwise I will.