Many builds fail for environmental reasons (Github is slow or down, Chocolatey, etc). These are typically easy to detect by scanning the last few lines of the console for known error messages, such as "fatal: The remote end hung up unexpectedly".

Perhaps we could define "environment failure messages" in appveyor.yml to identify and distinguish failed code from failed downloads.

These 'build incomplete' jobs could then be colored differently in the console and badges, or perhaps rerun once more after a certain time interval (with a priority of lowest, of course).