Haxelib packaging

Hi Justin

I've used [mlib](https://github.com/massiveinteractive/MassiveLib#using-the-mlib-tool) to add haxelib packaging.  Basically all you'd need to do is run 'haxelib run mlib submit' and it would package it as a zip and submit it to haxelib for you.

MLib did require me to specify a license file, but I didn't see one specified so I put in MIT.  If you'd like to use a different licence let me know and I'll update it :)

If the whole "mlib" thing doesn't work for you let me know and I'm happy to email you the zip to submit manually.

Jason