Small improvement in previous commit
QR code function implemented,

Need to install following modules:
1. https://pypi.python.org/pypi/qrcode
2. http://www.pythonware.com/products/pil/
3. https://pypi.python.org/pypi/django-bootstrap3-datetimepicker/

Use "QR code" link from from home page's menu instead of "Manage QR code". For some reasons I get some error while implementing DateTimePicker in bootstrap Modal. I will try to discuss with our team leader Kim about this.