Don't Throw on 500 Errors

[xjamundx]

Currently resource.js does this on line 139:

if (e.status >= 500) {
    throw new(Error)(e);
}

We shouldn't throw in this case but let the engines handle it however they please.

[xjamundx]

I'm dealing with a particularly annoying server right now (PHP serialized data, bla bla bla), so I'm looking for some flexibility in my engine :)

[indexzero]

Yeah, I agree here, it's an async thing so throwing has unintended side-effects