Bump version to 3.3.1

Merge pull request hardbyte#629

Release v3.3.0

Update changelog for v3.2.1

Minor version bump and doc update

Minor version bump and doc update

update wheel package before deploy

Merge pull request hardbyte#580 from hardbyte/release-3.2.0

Release 3.2.0

Use travis stages instead of matrix (hardbyte#577)

Update job names in travis stages

Update version to alpha2 for release3.2