Cleanup AppController for not existing conf tokens
Update conf tokens used
Support for forced XMPP service + code cleaning. close #654

 - You can now set in Info.plist TNArchipelServiceTemplate wich will be used as default service when user type his JID.
 - You can set in Info.plist TNArchipelForceService to force using a predefined XMPP service (using TNArchipelForcedServiceURL)
 - If TNArchipelForceService is on, the Service related fields are masked
 - There is no more credentials history.