Handlers.Call.Originate: Substituting protocol description with a link to the protocol specification.
Handlers.Call.Originate: Only the deprecated form of the interface is implemented at the moment.
Model: Terminology update.
Model: Image and Value functions for Reception_Contact_Identifier.
Model.Contact: Using Reception_Contact_Identifier instead of separate Contact_Identifier and Reception_Identifier.
Handlers.Call.Originate: Bug fix (bad parser).  Reorganising function Generate_Response.
Merge pull request #155 from sparre/master

Handlers.Call.Originate: Bug fix and clean-up.