Fixed logitech_camera node

The logitech camera node was not working because of ros::init error.
They creaped in because the LogitechCamera contructor was not calling
Sensor constructor properly. This has been fixed now.

	modified:   ../../../agv_framework/include/environment/Sensor.hpp
	modified:   ../../../agv_framework/src/environment/Sensor.cpp
	modified:   CMakeLists.txt
	modified:   include/LogitechCamera.hpp
	modified:   src/LogitechCamera.cpp