Merge pull request #699 from PaddlePaddle/ngram

move scripts of ngram to s0

examples/ngram_lm/path.sh → examples/ngram_lm/s0/path.sh

-export MAIN_ROOT=${PWD}/../../
+export MAIN_ROOT=${PWD}/../../../
 
 export PATH=${MAIN_ROOT}:${MAIN_ROOT}/utils:${PATH}
 export LC_ALL=C
@@ -7,4 +7,4 @@ export LC_ALL=C
 export PYTHONIOENCODING=UTF-8
 export PYTHONPATH=${MAIN_ROOT}:${PYTHONPATH}
 
-export LD_LIBRARY_PATH=/usr/local/lib/:${LD_LIBRARY_PATH}
\ No newline at end of file
+export LD_LIBRARY_PATH=/usr/local/lib/:${LD_LIBRARY_PATH}