Only look up Commit authors/committers by email
- Removes looking up authors/committers by name
- Renames
User.find_for_committoUser.find_by_any_email
Closes #1850 (closed)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
User.find_for_commit to User.find_by_any_email
Closes #1850 (closed)