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
Merge pull request #497 from nschneid/patch-10

SemcorCorpusReader was returning incomplete sense information