email-footer: add links to the expected common binary packages
email-footer: add links to the expected common binary packages

We can do other OSs like 32 and 64-bit OS X, but we should encourage
users to use the installer on OS X so we'll omit it here.

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node