Release 0.5.0 [ci skip] (pygae#433)

* Bump version to 0.5.0 [ci skip]

* Update 0.5.0 release date [ci skip]

Release 0.5.0rc1 [ci skip] (pygae#404)

Bump to 0.4.5

Merge pull request pygae#204 from pygae/0.4.5-rc-more

Support trigger CircleCI publish by tags

Merge pull request pygae#203

Support using CircleCI to publish to PyPI

Release 0.4.4

Python3, bugfixes, tests.