checks for NaN left/right position to ignore them
checks for NaN left/right position to ignore them
adds NaN test
Merge branch 'efernandez/check_nan_position' of https://github.com/efernandez/ros_controllers into efernandez/check_nan_position

Conflicts:
	diff_drive_controller/src/diff_drive_controller.cpp
fixes nan comparison
2014
adds comment about NaN for one cycle after start
Merge pull request #36 from efernandez/efernandez/check_nan_position

checks for NaN left/right position to ignore them