Removed obsolete PunktWordTokenizer, cf https://github.com/nltk/nltk/pull/746
Removing left-over PunktWordTokenizer import
Remove remaining googlecode URLs
Fix a few typos in corpus.doctest
word_tokenize for languages other than English
Merge pull request #748 from pquentin/develop

Removing left-over PunktWordTokenizer import
Update data.py
Merge pull request #762 from farleyknight/patch-1

Fix typo in data.py
Merge pull request #750 from pquentin/doctest-typos

Fix a few typos in corpus.doctest
Merge pull request #751 from jnothman/word_tokenize-lang

word_tokenize for languages other than English
Merge pull request #749 from pquentin/googlecode-url

Remove remaining googlecode URLs
Avoid imports of tkinter in nltk.sem if tkinter is not available.