Fixes an error in ad850c4 where only the 64-bit package was deployed.
However, it is not clear that Travis supports deployments from multiple
parallel jobs, and it is also not clear how racy tagging and deploying is
going to work.  This is an attempt to see what happens: the 2nd tag may
fail and abort its deploy.

Sets the GitHub Release title and description.
Fixes a git diff error on Appveyor tagged builds.

Issue: #1967