Bug clearing, code optimizing

- Implement the missing ping handler in the bridgeServer
- reduced amount of active logmessages in general
- cleared a bug in requestHandlers.update. Number of
  avaliable updates not counted - pa-manager never got
  any updates. Now size of array will be checked to determine.
- added update result status logmessage in pa-manager. Now shows
  number of new vars, updated vars and required client-pushs.