Add node v8 (#1951)
Add node v8 (#1951)

* Add node v8
* enable node v8 testing, permitting v8 failures
smfreegard/Haraka,smfreegard/Haraka,haraka/Haraka,haraka/Haraka,msimerson/Haraka,haraka/Haraka,msimerson/Haraka,smfreegard/Haraka,haraka/Haraka,msimerson/Haraka,msimerson/Haraka,smfreegard/Haraka