Add ability for user to override auth token for specific scope

Clement Ho
2019-11-06T07:24:53Z

In v1.0, auth tokens are stored at a `member` level. Although most people will fit this criteria, there may be some users who have different gitlab accounts for different organizations (trello teams). We need to add the ability for a user to specify auth tokens for organizations or boards (if they choose to do so) but default it as `member` scope.