Add AppVeyor config
Add AppVeyor config

Note, I've removed Debug-CI as it was the configuration for non-integration tests. Since the integration tests are gone, we so is the Debug-CI.

vosen/VisualRust,PistonDevelopers/VisualRust,PistonDevelopers/VisualRust,Boddlnagg/VisualRust,vosen/VisualRust,Boddlnagg/VisualRust