Fix Docker image, deprecate main.yaml.

PlantUML support, diagram refactoring, colors.

Fix #8 and #9.

Add support for backtick-fenced code blocks.

Fix Google upload for Docker.

Attempt to fix Travis build. Tagging to trigger the build.

Support complementary Swagger file with swagger2markdown>=0.1.9.

Fix local nested image handling.

Properly handle unresolved file lookups.

Add advanced Markdown include support.