* add .gitattributes
* add long wav
* fix some bugs
* updated lint error
* back the hi_xiaowen/run.sh to the same
* remove the space
* better one
* remove 'num_keyword' parameter
* remove files
* flask8 examine
* override the score and compute_det file
* remove defaultdict
* remove import defaultdict
The sigmoid() in kws/model/kws_model.py:KWSModel() was moved into kws/model/loss.py:max_pooling_loss()
To compute the posterior score correctly, the sigmoid() should also be added to kws/bin/score.py:main()