* change opt name in word2vec

* update index.cn.html

* Rewrite 08.machine_translation using Paddle-1.6 apis.

* Delete the old train.py in 08.machine_translation

* Update train.py to seq2seq.py in README_cn 08.machine_translation.

* Fix the print content of seq2seq.py.

* Update code format in README_cn of 08.machine_translation.

* Upgrade w2v & srl's api

* Upgrade label semantic roles api

* unify paddle 1.6 api in understand_sentiment

* change layers.data to fluid.data
* change layers.embedding to fluid.embedding

* fix typo:Infererence

* fix data api

* Modify the formula of lstm

* Update README.cn.md

* Update README.cn.md

* Unify 1.6 api in 06.understand_sentiment

* fix a bug in README.md

* Update README.cn.md

* Modify the formula of lstm

Fixed issue with train_dyn_rnn.py training report nan

update coding_guideline

* fix reader

* update readme

Modified the bug in understand_sentiment
icafe : http://newicafe.baidu.com/issue/76263402/show?cid=5&spaceId=23205&from=email&noticeStatistics=23969354

fix : http://newicafe.baidu.com:80/issue/DLTP-1929/show?from=page， fix book code is not compatible with python3

Modify the code to support python3: fix problem in book05 doc and code

fix link and some mistake in 01.fit_a_line and 09.gan

* modified reademe

Modify the location of test_program definition

mv import __future to begging of file 

use numpy.asarray as data initializer