Treat emails as Pull Requests in Github

[jeremyscatigna]

For team collaboration it could be important when writting an to have feedback or reviews or an approval so a way way to enable that would be to treat emails just like Pull Requests in Github which means:

• If you are an admin or you are the only member of your team you can send emails directly
• Else When you write an email instead of the sending button You have a create PR button when exactly like on Github you can add labels, comments...
• When reviewed or approved or you've received feedback you can send the email