update demo

fix gpu free

fix gpu free

refactor tokenizer and model initialization; update version to 1.3.7

1.3.6 version

Merge remote-tracking branch 'origin/master'

fix https://github.com/shibing624/text2vec/issues/163

remove gensim

update 1.3.4

Merge pull request #161 from zjx20/fix-adamw

use AdamW from torch.optim instead

update word2vec url.

update word2vec.

update word2vec light model download url.

update setup.