os.tmpdir() began stripping trailing slashes in
b57cc51. This causes problems if
the temp directory is simply '/'. It also stripped trailing
slashes without first determining which slash type is used by
the current operating system. This commit only strips trailing
slashes if another character precedes the slash. On Windows, it
checks for ':', as not to strip slashes from something like 'C:\'.
It also only strips slashes that are appropriate for the user's
operating system.

Fixes: #1669
PR-URL: #1673
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Christian Tellnes <christian@tellnes.no>

PR-URL: nodejs#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