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()
Removed NLTK_JAR from classpath when Java is called. Fix for path decoding.
Typo
Initial fix to call Mallet CRF SimpleTagger
Re-implementating of FreqDist using Counter, cf https://github.com/nltk/nltk/issues/86
subprocess communciate() encoding, cf https://github.com/nltk/nltk/issues/529
fixed some encoding bugs in wordnet_app.py, cf https://github.com/nltk/nltk/issues/535
Merge pull request #534 from jskda/pull_request.internals.find_file

subprocess communciate() encoding, cf https://github.com/nltk/nltk/issues/529
changed package imports to avoid calling sem.logic and sem.relextract
Merge branch 'master' of https://github.com/nltk/nltk
updated imports for chunk package
updated source docs for web pages
Edited docstrings to make it more clear how to get API documentation
for corpus readers that use LazyCorpusLoader.
Merge branch 'master' of https://github.com/nltk/nltk