Correct naming for Custom Fields

Hi again,

I'm trying out something with custom fields and I noticed that the custom field names are being created incorrectly according to http://requesttracker.wikia.com/wiki/REST.  I've changed the create_ticket and edit_ticket methods but have left search unchanged since there an example on that page which uses the dot notation.  No tests I'm afraid as I'm not sure that the easter egg instance will allow that.

Thanks
Stewart