Maslow: create editor, admin permissions
Grant editor perms to all current maslow users

Before the introduction of permissions into Maslow, anyone with a `signin`
permission can perform any change within the app. Once permissions are live,
then anyone with the `signin` permission can view only.

In order to preserve editing for the users who have been entrusted with that
ability up to now, all Maslow users get the extra `editor` permission.
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