update to opencv 3

[imrasp]

ORB-SLAM2 Copyright (C) 2014-2016 Raul Mur-Artal, University of Zaragoza.
This program comes with ABSOLUTELY NO WARRANTY;
This is free software, and you are welcome to redistribute it
under certain conditions. See LICENSE.txt.

Input sensor was set to: Monocular

Loading ORB Vocabulary. This could take a while...
Vocabulary loaded!

Parameters: 
OpenCV Error: Bad argument (Invalid pointer to file storage) in cvGetFileNodeByName, file /build/buildd/opencv-2.4.8+dfsg1/modules/core/src/per
sistence.cpp, line 740
terminate called after throwing an instance of 'cv::Exception'
  what():  /build/buildd/opencv-2.4.8+dfsg1/modules/core/src/persistence.cpp:740: error: (-5) Invalid pointer to file storage in function cvGet
FileNodeByName

[VIO-2] process has died [pid 89, exit code -6, cmd /opt/ros/indigo/share/ORB_VIO/VIO /home/rasp/LearnVIORB/Vocabulary/ORBvoc.bin /home/rasp/Le
arnVIORB/config/euroc.yaml __name:=VIO __log:=/home/rasp/.ros/log/9713f032-ec7a-11e7-aa1a-0242ac110002/VIO-2.log].
log file: /home/rasp/.ros/log/9713f032-ec7a-11e7-aa1a-0242ac110002/VIO-2*.log
^[^[^C[rosout-1] killing on exit
[master] killing on exit
shutting down processing monitor...
... shutting down processing monitor complete
done

[imrasp]

ORB-SLAM2 Copyright (C) 2014-2016 Raul Mur-Artal, University of Zaragoza.
This program comes with ABSOLUTELY NO WARRANTY;
This is free software, and you are welcome to redistribute it
under certain conditions. See LICENSE.txt.

Input sensor was set to: Monocular
Failed to open settings file at: /home/rasp/LearnVIORB/config/euroc.yaml
[VIO-2] process has died [pid 94, exit code 255, cmd /opt/ros/indigo/share/ORB_VIO/VIO /home/rasp/LearnVIORB/Vocabulary/ORBvoc.bin /home/rasp/LearnVIORB/config/euroc.yaml __name:=VIO __log:=/home/rasp/.ros/log/c9a9c4b2-ec7b-11e7-9424-0242ac110002/VIO-2.log].
log file: /home/rasp/.ros/log/c9a9c4b2-ec7b-11e7-9424-0242ac110002/VIO-2*.log

[teeramoo]

Move from openCV 2.4 to 3.0 ?