change program name of pycrfsuite

[fanchyna]

pycrfsuite is the same name as a function used in NLTK, so anytime NLTK is imported, its submodules import a module called crf.py which imports a module called pycrfsuite. Because there is a local file called pycrfsuite.py, NLTK imports the local copy which is buggy. As a result, anytime I try to run a program that imports nltk, it runs a statement inside the local pycrfsuite, which prints an error message.

Please change its name to something else to avoid such an issue. Thanks.