Add cc: sam@agileventures.org to mailers

Pivotal Tracker https://www.pivotaltracker.com/story/show/67381726
Only cc: added to both mailers, no refactoring.
Is it possible to avoid repetition in mailer_spec.rb?
having it as `cc_sam` already ties it to one email address. Perhaps renaming it to `have_default_cc_addresses` would be more clear about your intentions