Make connecting to ROS on the RPi easier

[smaria]

• Add all our laptops to the RPi configuration
• enable all our laptops to be part of ROS running on the RPi

Basically, this needs to be implemented to work permanently rather than re-done every time we need it: http://wiki.ros.org/ROS/NetworkSetup

[smaria]

Btw, this will also allow us to use things like rqt console, which can print error messages, debug messages and warnings of select nodes etc. http://wiki.ros.org/rospy/Overview/Logging