logging format / method

[markusachtelik]

Plain text was guideline. However, since we have to take care of the evaluation ourselves anyway, I'm very much inclined towards using rosbag and its c++/python api http://docs.ros.org/hydro/api/rosbag/html/
--> good performance for logging
--> almost no serialisation / deserialisation implementation effort for us, reuse of all defined messages
--> python api for processing, or even matlab in worst case
ros base install should include all necessary dependencies

[ffurrer]

Since we accepted on this and we already have a rosbag logger I'm closing this.