owners team is responsible for the applications, people, teams and access management of an organization.
The owners team cannot be removed and always has at least one member. The owners team also has
admin access to all applications in an organization.
Only members from the owners team can be used as the API user (the user that connects to GitHub or Bitbucket of an application. That makes it also important for those users to remain a GitHub or Bitbucket account connected to wercker.