[CI] enabled node 4 in Travis builds + more CI fixes

[bestander]

Summary

• Travis was not running tests in Node 4 (see node --version output in https://travis-ci.org/yarnpkg/yarn/jobs/188493526)
• Added node --version to appveyor builds logs
• Added OSX Node 6 builds to Travis builds
• increased timeouts for the longest running tests

[Daniel15]

We've had reliability issues with Travis OSX builds in the past, we'll need to disable the OSX builds again if they're flaky and give us false failures. Maybe they'll be better now.

[bestander]

Yeah, I'll monitor them for a couple of days. Currently seems like only one test is failing from time to time

…

On Tue, 3 Jan 2017 at 21:54, Daniel Lo Nigro ***@***.***> wrote: ***@***.**** commented on this pull request. We've had reliability issues with Travis OSX builds in the past, we'll need to disable the OSX builds again if they're flaky and give us false failures. Maybe they'll be better now. — You are receiving this because you modified the open/close state. Reply to this email directly, view it on GitHub <#2370 (review)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ACBdWMvDZEoLXrZq7kqExeZXkrMT1_CIks5rOsN_gaJpZM4LZh4l> .