Turned on beaming in RatioTaleaRhythmMaker.

NOTE: this changes the default behavior of the class. But should be for the
better.

The class previously didn't respect beaming directives. To continue to use the
class in that way, do this:

    >>> beam_specifier = rhythmmakertools.BeamSpecifier(
    ...     beam_each_cell=False,
    ...     beam_cells_together=False,
    ...     )
    >>> maker = rhythmmakertools.RatioTaleaRhythmMaker(
    ...     beam_specifier=beam_specifier,
    ...     )