* Resolves modin-project#878
* Create a `SeriesGroupBy` object that intercepts every call to the
  `SeriesGroupBy` object, applies it to the pandas object, then
  re-distributes the object if it is a `pandas.Series` or a
  `pandas.DataFrame`. This is a temporary measure until we can implement
  a `SeriesGroupBy` object with all of the methods.
* This issue originally surfaced with issues handling interactions
  between pandas and modin Series objects.
* A further pass is required to remove other cases where Modin can
  return a pandas object.