promise wrapper for node's less friendly APIs - net.connect etc

async_object.js

// e.g
//   asyncObject(net.connect,{port: 8125})
function asyncObject(constructor) {
  var args = [].slice.call(arguments,1);
  var obj = constructor.apply(null,args);

  return new Promise(function(resolve,reject) {
    obj.once("error",reject);
    obj.once("connect",function() {
      resolve(obj);
    });
  });
}