Application reads QR code, aligning image if it's not centered.
Install dependencies:
sudo apt-get install libzbar-dev
sudo apt-get install python3-dev
sudo apt-get install python-dev
Create virtualenv with Python 2.7:
mkvirtualenv some_virtualenv -p python2
Activate virtualenv:
workon some_virtualenv
Install python packages from requirements.txt:
pip install -r requirements.txt