Add Way to Read in Files URLs

[jresig]

A simple way to load files over the network would be incredibly useful, like in the following:

  var contents = intrinsic::readURL("http://google.com/");

Text-only files would be sufficient.

[dherman]

I've committed a simplistic implementation of this. It's HTTP only, text only. The intrinsic::readURL function takes a string (HTTP URL) and optionally a string for the HTTP method and an object mapping header keys to header strings. It returns an object with four fields:

{
    status: uint,
    statusText: string,
    headers: Object,
    responseText: string
}