Tweak so that ParsingShell should with newer and older NLTK.
Tweak so that ParsingShell should with newer and older NLTK.

dmcc/bllip-parser,BLLIP/bllip-parser,dmcc/bllip-parser,BLLIP/bllip-parser,yv/bllip-parser,BLLIP/bllip-parser,BLLIP/bllip-parser,BLLIP/bllip-parser,yv/bllip-parser,dmcc/bllip-parser,yv/bllip-parser,BLLIP/bllip-parser,yv/bllip-parser,BLLIP/bllip-parser,antimatter15/charniak-emscripten,dmcc/bllip-parser,antimatter15/charniak-emscripten,dmcc/bllip-parser,antimatter15/charniak-emscripten,antimatter15/charniak-emscripten,yv/bllip-parser,BLLIP/bllip-parser,antimatter15/charniak-emscripten,dmcc/bllip-parser,antimatter15/charniak-emscripten,dmcc/bllip-parser,dmcc/bllip-parser,antimatter15/charniak-emscripten,antimatter15/charniak-emscripten,yv/bllip-parser,antimatter15/charniak-emscripten,yv/bllip-parser,antimatter15/charniak-emscripten,yv/bllip-parser