Release process:
- Make sure you are on the proper release branch
- Make a git tag
  git tag vX.Y.Z
- Push to master the commit and the tag
    git push --tags central master
  This push will trigger package builds for windows and linux that will
  be uploaded to the mila-udem conda channel.
- Add a release on github with a tag in the form of 'vX.Y.Z'
  https://github.com/Theano/libgpuarray/releases/new
 - Make note of the major changes since the last release
