(GH-599) Restrict calls to choco.org to https

This proved the changes required to ensure that client communicates with
chocolatey.org using HTTPS.
(GH-600) Give maintainer heads up about moderation

This keeps maintainers from guessing about what might be happening. It also
adds a self-policing call that maintainers should ensure they can receive email
from chocolatey.org and the google group without ending up in the spam folder.