Exclude blockdiag and shaape tests on Windows
Try to update rubygems to work around SSL failure on appveyor
Add build status badges to README
Install graphviz on appveyor
Make rubygems update quiet
Make bundler install verbose (seems to be hanging on appveyor)
Enable bundler gem caching on Travis
Make rubygems update even more quiet
Make bundler install even more verbose (seems to be hanging on appveyor)
Correct syntax error in travis.yml
Replace --deployment with --path vendor/bundle
Use unencrypted rubygems on appveyor
Appveyor build tweaks
Use http://rubygems.org as source for bundler installation
Another attempt using http://rubygems
Simplify appveyor detection
Update plantuml to v8014
Log an error message when image generation fails instead of throwing an exception
Merge branch 'master' of https://github.com/asciidoctor/asciidoctor-diagram