removed graphic "Aufbau des Dokumentes" since it is not up to date and not sure about its usefulness

Changed systemarchitecture by specifying what hardware parts are connected and summing up what STM and Odroid do

Tested functions:
- nodelets
- one nodelet accessing different topics
- one nodelet listening to different topics
- using boost::threads in nodelets
- using .launch files
- using customized messages
- using folder structure for different nodelets