Red repurpose Author#email_addresses
Red repurpose Author#email_addresses

Change `Metasploit::Cache::Author#email_addresses` to be `through:
:contributions` instead of `through: :module_authors`.  Spec
`#module_author_email_addresses` to be `through: :module_authors`.

rapid7/metasploit-cache,rapid7/metasploit-cache,rapid7/metasploit-cache,rapid7/metasploit-cache