Running to authentication success on the Apache module!

Running to authentication success on the Apache module!

Changes:
* The test.html script now respects the server path form field,
  rather than insisting on "/gss"
* The server path field now defaults to "/gss/" so that we don't
  get a HTTP 301 (Redirect) return code
* The gssweb object now opens the XHR connection with each message,
  instead of assuming incorrectly that the connection will remain
  open after each XHR response completes.