Show collaborated apps in members command

[raulb]

e.g.: In a command like:

$ heroku members -o my-org
collaborator@email.com    collaborator
jack@sparrow.com          collaborator
diego@simeone.com         admin

I'd like to see in what apps the users collaborator and jack are collaborating to without having to navigate through each application.

[raulb]

Or maybe just show that with the -x option.

@itchymutt what do you think?