将模型库中不存在词的向量值由全0替换为随机向量

Resolve the ImportError when there's "utils" model.

import gzip

import shutil and from six import string_types, u

Run flake8 tests on all new code submissions

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update similarity_distance weights

Update __init__.py

Use _levenshtein_distance() to replace _unigram_overlap. We still need to adjust weight for better result. Right now following two sentences are still regarded as same.

synonyms.compare('目前你用什么方法来保护朋友',  '目前你用什么方法来保护家人')

fix python3 open stopwords file UnicodeDecodeError bug