sensorServer changes
- add posix timer for reading periodically the i2c sensor
  - not sure if this is really necessary
  - signal of posix timer and socket don't like eachother, so the programm crashes
  - have to go to bed now, because i have to get up in less than 4 hours :-(
- prepare some stuff for communication protocoll, but neither tested nor ready
Merge remote-tracking branch 'refs/remotes/origin/master'