Merge pull request #3 from nltk/master

Merge updates from NLTK master
SemcorCorpusReader was returning incomplete sense information

semcor.py was creating lemma sense tags as strings of the form `<lemma>.<sensenum>`, which is incorrect: the sense number is actually POS-specific. With this fix, SemcorCorpusReader tries to retrieve the Lemma object directly from WordNet (using the sense key). If that fails, a string of the form `<lemma>.<pos>.<sensenum>` is given.
pass wordnet corpus reader to semcor corpus reader
Merge pull request #1 from nschneid/patch-11

pass wordnet corpus reader to semcor corpus reader
corpus.doctest: update for semcor
Merge pull request #2 from nschneid/patch-11

corpus.doctest: update for semcor
except Exception
Add support for unicode terms to nltk.chunk.named_entity.shape()
bug in chat80 doctest
Merge branch 'master' of https://github.com/jskda/nltk into counter
remove caching and rewrite Nr code
avoid modifying dictionary during iteration over dictionary
merge stevenbird/fdist
replaced freqdist.inc(x) with freqdist[x] += 1
fix error in previous commit
merging changes from https://github.com/jskda/nltk/commit/7f8a67113909da5fcc7323a2902343e5480ade7d but preserving Nr instead of nr
incorporating more suggestions from https://github.com/nltk/nltk/pull/544
Merge branch 'master' of https://github.com/nltk/nltk into fdist
apply fixes from https://github.com/jskda/nltk/commit/9e41f5286ae99e66f054118fef6213c820b2ce1d
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