Stomp.connect should accept custom headers

[mk-codepool]

Hi, I'm using webstomp in Aurelia project, cause of possibility of .subscribe. In original repo .connect() accepts custom headers, like: .connect({'Authorization': 'Bearer 123'})

In your 'index.d.ts' i see, that connect accepts only:

• headers: ConnectionHeader
• login: string, passcode: string

... before callback function, but ConnectionHeader interface contains only: login: string; passcode: string; host?: string; If I change it to any, Stomp sends request as ussualy with my custom header.

My example:

websocketConnect(){
    var socket = new SockJS('https://my-rul');
    var stompClient = Stomp.over(socket);
    var token = `Bearer ${this.authService.getAccessToken()}`;
    stompClient.connect({'Authorization' : token}, frame => {
        stompClient.subscribe('/some-subchannel', msg => {
            // ...
        });
    });
}

[JSteunou]

Feel free to open a PR on the .ts I do not and will never maintain it by myself

[JSteunou]

closed by #46