Changes since: SkypeTX 1.7.1.4
NEW - Add internal security call header to phonebox start handset call request
FIX - Fix Rest API self-hosting references
FIX - Rest API not starting correctly in service mode
FIX - Build to incorporate positive custom payload number fix for skype and vx handsets
FIX - Internal call message handler not registered correctly in SkypeTX.Service Rest Api start up
