postLoginHandler for OAuth2 Password Grant

[passatgt]

Fix for issue #507

[robertjd]

Thanks @passatgt - though I don't think we want this to be triggered for the refresh_token workflow, only password.

[passatgt]

Ok, makes sense, i guess it works like this, i just didn't wanted to duplicate the case, because otherwise its the same.

[robertjd]

Can we update this to use the existing switch structure? Thanks!

[passatgt]

I had to change it yet again. The account is not returned by the request, added client.getAccount instead.