Log Message:
textproc/py-nltk: import py-nltk-3.4.1

Based on wip version packaged by leot, Hiramatsu Yoshifumi,
Kamel Ibn Aziz Derouiche, and myself.

NLTK - the Natural Language Toolkit - is a suite of open source
Python modules, data and documentation for research and development
in natural language processing. NLTK contains code supporting dozens
of NLP tasks, along with 30 popular Corpora and extensive documentation
including a 360-page online book.