Producing import graphs listing all imported names except python standard
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findimports can produce a detailed list of all imported names

    >>> from findimports import main
    >>> exitcode = main(['findimports', '--names', '--ignore-stdlib', sample_tree])
    apple:
    <BLANKLINE>
    box.__init__:
    <BLANKLINE>
    box.cat:
      box.yarn
      decoy
    box.decoy:
    <BLANKLINE>
    box.yarn:
    <BLANKLINE>
    decoy:
    <BLANKLINE>
    orange:
    <BLANKLINE>
