Support Node 8

[xzyfer]

Tracking issue for Node 8 support to stop all the duplicate issues. Support was added in 4.5.3 but the binaries still need to be built.

• OS X x64 (@xzyfer)
• Linux x86 (@xzyfer)
• Linux x64 (@xzyfer)
• Alpine (@xzyfer)
• Windows x86 (@nschonni)
• Windows x64 (@nschonni)

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[xzyfer]

@am11 are you able to build the Windows binaries whilst we wait for AppVeyor to catch up please?

[nschonni]

Fudged the appveyor to get it to produce the bindings, just waiting on the queue https://ci.appveyor.com/project/sass/node-sass/build/2531

[nschonni]

@xzyfer windows bindings are done

[xzyfer]

Are you able to add binaries to releases?

[xzyfer]

I've hit a snag with the Linux binaries. We build them on CentOS 5 which recently EOL'd so our docker image isn't currently working.

[nschonni]

Yes, not sure if we're running into each other since i'm getting "binary already exists". I'll give it a few minutes in case you're doing it right now

[xzyfer]

I'm not touching releases atm.

[xzyfer]

I don't see it on the release so I can't explain that error.