CC reviewer on email once supervisor releases evaluation

EV-98

The BC reviewers need to be notified after the supervisor has set
the recommended increase value. The easiest way to do it was to CC
the reviewers after the supervisor released the evaluation for
signature.
Add comments to explain workaround

EV-98

Currently, we CC reviewers in the signature* emails for Classified IT
evaluations. The current workaround is to do it via the code. It was
the simpler solution. Added comments to explain future code changes in
the future to make things cleaner (but they will require more code
changes).
Merge pull request #6 from osu-mist/feature/EV-98-cc-bc-on-complete

CC reviewer on email once supervisor releases evaluation