Update angular.d.ts missing statusText property

On IHttpPromiseCallbackArg added missing statusText property.

From angular's API

    data – {string|Object} – The response body transformed with the transform functions.
    status – {number} – HTTP status code of the response.
    headers – {function([headerName])} – Header getter function.
    config – {Object} – The configuration object that was used to generate the request.
    statusText – {string} – HTTP status text of the response.