Merge pull request #17 from mlosch/master

calibrated turn and forward controller. parameter update in motor_controller
Merge pull request #18 from mlosch/master

remove robot.h. Is now in common package
Added wall_following_controller. It still needs to be checked on the robot
Added wall_following_controller. It still needs to be checked on the robot
Merge pull request #19 from marro10/master

Added first version of wall_following_controller
merge with master