chore(travis): add Node v7, drop Node v0.10 and v0.12 from CI
chore(travis): add Node v7, drop Node v0.10 and v0.12 from CI

falsandtru/power-assert,twada/power-assert,falsandtru/power-assert,twada/power-assert,power-assert-js/power-assert,power-assert-js/power-assert