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?
As you say, the check for `nil` is there to avoid a less-clear failure with a `NoMethodError`.

Re:custom matcher - Is there another way to ensure that changing the cc address only needs to happen in one place rather than multiple times in multiple files?