Updated install.sh to make it path independent

This would allow you to execute script like /home/pi/pi_video_looper/install.sh

install.sh

@@ -26,6 +26,7 @@ rm -rf pi_hello_video
 
 echo "Installing video_looper program..."
 echo "=================================="
+cd "$(dirname "$0")"
 mkdir -p /mnt/usbdrive0 # This is very important if you put your system in readonly after
 python setup.py install --force
 cp video_looper.ini /boot/video_looper.ini