Use the new form of the AuthCompletionHandler
Use the new form of the AuthCompletionHandler

This changes the communicationhelper to use the new form of the
`AuthCompletionHandler` (change in
https://github.com/e-mission/cordova-jwt-auth/pull/13/commits/cfa54573fb611d1c82feeeecf1ec6ca8720450ad)

Also removes the obsolete callbacks which are not invoked any more

e-mission/cordova-server-communication,e-mission/cordova-server-communication