Initial appveyor.yml file.
Appveyor build updates.

- For now build only one ruby version.
- Windows does not support symlinking.
- Ansicon is needed for color.
Update matrix.
`[.]` doesn’t appear to work well on windows.
See what the host os is repotted as on appveyor.
Fix windows pending logic
Force non-ANSICON environment.

On appveyor we install ANSICON.