Implemented (ck) and (ck*) commands.

Example:

    Red Example Score (2013)

       1: __init__.py
       2: __metadata__.py
       3: build/
       4: distribution/
       5: makers/
       6: materials/
       7: segments/
       8: stylesheets/
       9: test/

          build (u)
          distribution (d)
          makers (k)
          materials (m)
          segments (g)
          stylesheets (y)

    > ck
    6 of 6 required directories found:
        /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/build
        /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/distribution
        /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/makers
        /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/materials
        /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/segments
        /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/stylesheets
    2 of 2 required files found:
        /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/__init__.py
        /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/__metadata__.py
    1 optional directory found:
        /Users/trevorbaca/Documents/abjad/scoremanager/scores/red_example_score/test

    >