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Add normative structmap and PREMIS 3 support

In order to document empty directories metsrw uses a mets:structMap with
TYPE "logical" and LABEL "Normative Directory Structure". This is done
so that the TYPE "physical" structMap can continue to document the files
and folders that are actually in the package. Since the BagIt spec
requires removal of empty directories, this strategy allows for their
removal while still documenting them in the normative structmap so that
they can be recreated later, if necessary.

- FSEntry treats empty directories differently from other filesystem
  entry types:

  - PREMIS objects for empty directories are placed in a dmdSec (as opposed to
    an amdSec as is done for files)
  - ``serialize_structmap`` has a ``normative`` boolean kwarg that allows for
    the creation of <mets:div> hierarchies with and without empty directories,
    i.e., for normative logical structmaps and physical structmaps,
    respectively.

- ``METSDocument`` gains ``_normative_structmap()`` method that returns an
  ``lxml._Element`` for the normative logical structmap.

- ``_parse_tree_structmap`` parses physical and normative structmaps
  simultaneously.

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