canReflect.new should work with native classes

[matthewp]

Currently if you do:

class Animal { }

canReflect.new(Animal, []);

It will throw with something like:

TypeError: Class constructor Animal cannot be invoked without 'new'

We should use Reflect.construct where available.

[matthewp]

I see why this is a difficult problem. The implementation of canReflect.new exports a can.new symbol. In my use case I can add such a symbol. So I'll do that.

[justinbmeyer]

I think can-reflect.new should simply use Reflect.new if that exists, instead of faking it like it currently does:

var context = Object.create(func.prototype);
			var ret = func.apply(context, args);
			if(type.isPrimitive(ret)) {
				return context;
			} else {
				return ret;
			}