PR-URL: nodejs/node#1679

Notable Changes:

* win,node-gyp: the delay-load hook for windows addons has now been
correctly enabled by default, it had wrongly defaulted to off in the
release version of 2.0.0 (Bert Belder) nodejs#1433
* os: tmpdir()'s trailing slash stripping has been refined to fix an
issue when the temp directory is at '/'. Also considers which slash is
used by the operating system. (cjihrig) nodejs#1673
* tls: default ciphers have been updated to use gcm and aes128 (Mike
MacCana) nodejs#1660
* build: v8 snapshots have been re-enabled by default as suggested by
the v8 team, since prior security issues have been resolved. This
should give some perf improvements to both startup and vm context
creation. (Trevor Norris) nodejs#1663
* src: fixed preload modules not working when other flags were used
before --require (Yosuke Furukawa) nodejs#1694
* dgram: fixed send()'s callback not being asynchronous (Yosuke
Furukawa) nodejs#1313
* readline: emitKeys now keeps buffering data until it has enough to
parse. This fixes an issue with parsing split escapes. (Alex Kocharin)
* cluster: works now properly emit 'disconnect' to cluser.worker (Oleg
Elifantiev) nodejs#1386
events: uncaught errors now provide some context (Evan Lucas) nodejs#1654