Resolves the following (which I got after liberating letter regexp a bit):

Traceback (most recent call last):
  File "/home/marcink/.virtualenvs/mojedevel/bin/calibre_report_duplicates", line 9, in <module>
    load_entry_point('mekk.calibre==1.3.2', 'console_scripts', 'calibre_report_duplicates')()
  File "/home/marcink/DEV_hg/python/mekk.calibre_utils/src/mekk/calibre/scripts/report_duplicates.py", line 356, in run
    ndp = author_index.get_near_dups(make_simhash(author))
  File "/home/marcink/.virtualenvs/mojedevel/local/lib/python2.7/site-packages/simhash-1.1.2-py2.7.egg/simhash/__init__.py", line 92, in get_near_dups
    sim2, obj_id = r.split(',')
ValueError: too many values to unpack
Additional info about reg in docstring.
Merge pull request #1 from Mekk/master

Bugfix and minor doc update