[Tests] Support only io.js 3.x (though it also works with 2.x and 1.x)
[Tests] Support only io.js 3.x (though it also works with 2.x and 1.x)

jest needs io.js 2.x and up but let's just support 3.x and eventually just Node 4.x.

ide/await-lock,ide/await-lock