Merge pull request tensorlayer#445 from tensorlayer/release-1.8.3

release 1.8.3

release 1.8.3rc0 (tensorlayer#429)

* release 1.8.3rc0

* update links for examples

release Binary Nets, release 1.8.1 (tensorlayer#423)

* update bnn cnn, htanh

* bconv example

* release binary

* release 1.8.2

release 1.8.1 (tensorlayer#393)

Merge pull request tensorlayer#381 from tensorlayer/release-1.8.0

Release 1.8.0

[release] 1.8.0rc (tensorlayer#362)

[release] 1.7.4

[release] 1.7.3

[release] 1.7.2

[release] 1.7.1