Support for Node 8 when it becomes LTS

[honzajavorek]

Based on #750 and snikch/goodman#22 (comment), there could be issues with Dredd on Node 7. It would be nice to add Node 7 to the testing matrix in Travis CI and to bump also various different places to mention 7 instead of 6 (e.g. AppVeyor builds).

Anyone willing to contribute this?

[honzajavorek]

According to this document it's better to wait for Node 8 to become LTS and then to switch.

[honzajavorek]

I tried to build Dredd on Node 8, it fails - https://travis-ci.org/apiaryio/dredd/jobs/292155038 Needs more work than just adding to the build matrix.

[honzajavorek]

Update: Everything works except some nuances in the sandboxed hooks (specificially, the test/unit/transaction-runner-test.coffee file). The Pitboss library doesn't seem to support Node 8 correctly, but I am yet to verify that. Two possible solutions:

• Fix Pitboss NG
• Remove Pitboss in favor of pure vm

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Update: Verified it's Pitboss inconsistency between Node versions apiaryio/pitboss#13

[honzajavorek]

Node 8 is already in .travis.yml for some time.