BE: Teams, Collaborators, Invites (Models, Controller, Routes)

[moffatethan]

These are just some notes for myself on the flow of how this should work. A user would be the team owner in this case.

As a user, I want to create a team and add collaborators to it.
As a user, I want to add collaborators to my team.
As a user, I want to create boards and be able to add collaborators to that board.
As a user, I want to see team invitations on my account.

As a team, I want to be able to get all collaborators.
As a team, I want to be able to create new boards.
As a team, I want to be able to private a board so only collaborators can see and view.

As a collaborator, I want to be able to see all boards available to me and who else has access to it.
As a collaborator, I want to be able to leave a team.
As a collaborator, I want to be able to view all boards but only edit the ones I am given access to.