Add hxnodejs to haxelib.json

[explorigin]

Abe depends on hxnodejs but it's not mentioned in the haxelib.json file. When I manually installed hxnodejs, things still didn't work because it's under API-breaking development. Be sure to specify the commit hash or tag that abe works with to ensure easy install. It looks like the commit is HaxeFoundation/hxnodejs@a0af3b9 .

You might consider adding version numbers to the other dependencies as well.

[fponticelli]

Sorry for the inconvenience. Can you specify the commit using haxelib?

[explorigin]

I'm not really sure. You can in NPM like so: https://docs.npmjs.com/files/package.json#git-urls-as-dependencies but I don't know how to test this with haxelib without pushing something up to the repo. I'll post the question to the list.