Merged revisions 74107 via svnmerge from

Merged revisions 74107 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r74107 | brett.cannon | 2009-07-19 20:19:18 -0700 (Sun, 19 Jul 2009) | 8 lines

  Importlib's documentation said that importlib.abc.PyLoader inherited from
  importlib.abc.ResourceLoader, when in fact it did not. Fixed the ABC to inherit
  as documented.

  This does in introduce an backwards-incompatiblity as the code in PyLoader
  already required the single method ResourceLoader defined as an abstract
  method.
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