Wrote (ine) MaterialPackageWrangler.edit_initializers() tests.

Example:

    Red Example Score (2013) - materials

       1: instrumentation
       2: magic numbers
       3: pitch range inventory
       4: tempo inventory

          materials - copy (cp)
          materials - new (new)
          materials - remove (rm)
          materials - rename (ren)

    > ine

    Will edit ...

       /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/instrumentation/__init__.py
       /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/magic_numbers/__init__.py
       /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/pitch_range_inventory/__init__.py
       /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials/tempo_inventory/__init__.py

    Ok? y