Use canOne instead of can so we can resolve the conflicts with authorization

[Ricky-rick]

Call the 'canOne' function instead of the 'can' function in the Middleware and ServiceProvider so we can make us of Laravel's authorization 'can' function. Now it's posible to use the Authorizable and the HasRoleAndPermission trait in the user model

class User extends Model implements AuthenticatableContract, HasRoleAndPermissionContract
{
    use Authenticatable, HasRoleAndPermission, Authorizable {
        Authorizable::can insteadof HasRoleAndPermission;
        HasRoleAndPermission::can as hasRoleAndPermissionCan;
    }
}