Install pyzbar to image (#225)

* Install pyzbar to image

I suggest installing pyzbar to RPi image for making barcodes scanning easier during different competitions.

* pyzbar: Add libzbar0 install

* pyzbar: Add simple tests

* pyzbar: Update docs

builder/image-software.sh

@@ -95,6 +95,7 @@ libjpeg8 \
 tcpdump \
 ltrace \
 libpoco-dev \
+libzbar0 \
 python-rosdep \
 python-rosinstall-generator \
 python-wstool \
@@ -157,6 +158,10 @@ echo_stamp "Installing ptvsd"
 my_travis_retry pip install ptvsd
 my_travis_retry pip3 install ptvsd
 
+echo_stamp "Installing pyzbar"
+my_travis_retry pip install pyzbar
+my_travis_retry pip3 install pyzbar
+
 echo_stamp "Add .vimrc"
 cat << EOF > /home/pi/.vimrc
 set mouse-=a

builder/test/tests.py

@@ -26,5 +26,6 @@ from pymavlink import mavutil
 import rpi_ws281x
 import pigpio
 from espeak import espeak
+from pyzbar import pyzbar
 
 print cv2.getBuildInformation()

builder/test/tests_py3.py

@@ -3,5 +3,6 @@
 # Make sure our Python 3 software is installed
 
 import cv2
+from pyzbar import pyzbar
 
 print(cv2.getBuildInformation())