function SkipWhileObservable(source, fn) {
      this.source = source;
      this._fn = fn;
      __super__.call(this);
    }
Bypasses a specified number of elements in an observable sequence and then returns the remaining elements.
@param {Number} count The number of elements to skip before returning the remaining elements.
@returns {Observable} An observable sequence that contains the elements that occur after the specified index in the input sequence.