Merge pull request #12 from myint/master

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cdiff.py

     'Svn': {
         'probe' : ['svn', 'info'],
         'diff'  : ['svn', 'diff'],
-        'log'   : ['svn', 'log', '--diff'],
+        'log'   : ['svn', 'log', '--diff', '--use-merge-history'],
     },
 }