Fixes ref() & unref() return value on NodeJS

[icebob]

Purpose (TL;DR) - mandatory

Fix issue #191

According to NodeJS documentation the ref() and unref() return the timer.
https://nodejs.org/dist/latest-v8.x/docs/api/timers.html#timers_timeout_ref

This PR fixes it in lolex. Relevant tests are added.

After fix it prints the correct timer:

const lolex = require("./src/lolex-src");
const clock = lolex.install();

const timer = setTimeout(() => {}, 5000).unref();
console.log(timer);
// Prints: { id: 1, ref: [Function: ref], unref: [Function: unref] }

[benjamingr]

Code LGTM although I'm really unsure what behaviour I'd expect.

[benjamingr]

Can you add .refresh here?

[icebob]

What is the .refresh?

[benjamingr]

It's a new API Node recently added in nodejs/node#20298 that landed in 10.2.0

[benjamingr]

If you don't feel like it I'll land and can release when I get back from the Node summit/JSConf next week.

Just saying I would appreciate it if you did it while touching that code - this will land regardless - no pressure.

Already very happy that you decided to contribute to the project :)

[icebob]

Ohh, I've not known about it. No problem, I'm adding it. :)

[icebob]

Done.

[icebob]

Or I need to add some "refresh" logic as well?

[fatso83]

I think adding the whole logic is a bit much in this (essentially unrelated PR), but adding a NOOP function returning the timeout should be sufficient. Someone else can supply a full PR.