Update to Nan 2.x

[SomeoneWeird]

I think I found everything that needed changing. Not sure what we want to do about explaining MaybeLocal vs Local, probably needs a sentence or two when we describe how Nan::New works initially?

Also if there are any style things you want me to change etc just lemme know.

R=@rvagg

[julianduque]

@rvagg this looks good to me

[ChALkeR]

Adding to the list: https://github.com/nodejs/node/issues/2798. Btw, this PR fixes #59.

[SomeoneWeird]

@kkoopa Thanks! I'll fix them up tomorrow when I get a chance :+1:

[rvagg]

sorry I haven't had a chance to review this, if @kkoopa is happy then I am, @julianduque has publish rights to push a new one out

[julianduque]

@SomeoneWeird let me know when changes from @kkoopa are ready and I'll bump and publish

[rvagg]

@julianduque would you mind adding "Adam Brady" (a.k.a. @SomeoneWeird) to both the README and credits.txt before publishing?

[SomeoneWeird]

@kkoopa Okay, I'm not really up on the best practice for what you should do about checking MaybeLocals. I pushed a commit that changes call me maybe to use Nan::To, if you have any comments on how I should format it etc would be appreciated. If it looks alright, i'll change the others and squash everything so we can merge.

[kkoopa]

The NAN docs already explain what's what. https://github.com/nodejs/nan/blob/master/doc/maybe_types.md

Best practice is: Use ToLocalChecked if the handle can be guaranteed not to be empty, otherwise use FromMaybe or ToLocal.

[SomeoneWeird]

Okay I pushed another commit, if you can't tell I barely know C++, so any help would be appreciated. Is something like this better?

[kkoopa]

Looking better, some places should still use Nan::To<>, the rest seems fine.

[SomeoneWeird]

@kkoopa When changing void Init(Handle<Object> exports) { to NAN_MODULE_INIT(Init) { I seem to get

../myaddon.cc:10:12: error: use of undeclared identifier 'exports'
  Nan::Set(exports, Nan::New("print").ToLocalChecked(),

Am I doing something wrong?

[kkoopa]

s/exports/target/

[SomeoneWeird]

Alright, how does this look?

[kkoopa]

Apart from that one letter documentation fix, it looks good to me.

[SomeoneWeird]

@kkoopa Awesome, thank you so much for your help :+1:

@julianduque Squashed, merge at will.

[julianduque]

Awesome work @SomeoneWeird @kkoopa :)

[ChALkeR]

59 should be closed now.

[SomeoneWeird]

@julianduque I just fixed an issue in e07cbab618a4d4c0e4b5408e3411ddbf61b259ba, are you able to publish 2.0.1?

[julianduque]

@SomeoneWeird published