Bug: Scope with function is not added correctly

[kingjerod]

If you have a scope with a function like so:

@Scopes({
  something: function (id) {
    return {
      where: {id: id}
    }
  }
})

It doesn't get added properly to the Sequelize model. I was ready to open a PR to fix this, but I think it's beyond my knowledge of this module. The problem is in resolveScope in the lib/services/model file, it should check if the options is a function and if so, just add the scope. I'm not sure if there is something else that needs to be done to the function.

[RobinBuschmann]

@kingjerod Thanks for contributing. I've investigated this one and... yes, you're right, this is a bug.