Merged revisions 72489 via svnmerge from

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  r72489 | gregory.p.smith | 2009-05-08 16:16:47 -0700 (Fri, 08 May 2009) | 3 lines

  Fix an off by one error on negative indexs to __getitem__
  http://code.google.com/p/ipaddr-py/issues/detail?id=15
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