missing libnabo in rosinstall

[panjekm]

git@github.com:ethz-asl/libnabo.git

[mfehr]

@panjekm are you sure this is required if you only build hand_eye_calibration packages?
I know it's required by some aslam_cv packages, but not sure we depend on those.

[panjekm]

it complained while trying to run the command thats in instructions:
catkin build hand_eye_calibration hand_eye_calibration_target_extractor hand_eye_calibration_batch_estimation

[mfehr]

#70