Added the IMU and GPS combined ros node.
This node output on: tf, as well and two custom message files (IMU and GPS)
To run:
rosrun beginnertutorials tf01GPSIMU 0 /dev/ttyUSB0 57600 /dev/ttyUSB1 4800 8.75
Where args:
[0] always 0 unless running two of these nodes.
[1] location of the IMU
[2] BAUD rate of the IMU (Should be 57600)
[3] location of the GPS
[4] BAUD rate of the GPS (Varies, try 4800 if in doubt)
[5] Accuracy threshold before the GPS's readings are taken seriously. (in meters)