Add qrcode to link to the poster website

Generated with http://goqr.me/#t=url  using the following url:

  https://github.com/jcfr/scipy_2014_python-cmake-buildsystem_poster
Add SciPy 2014 logo to the bottom right corner

Logo downloaded from

  https://github.com/scipy-conference/SciPy-2014/blob/master/scipy2014/static/img/scipy2014_logo_simple.png
Add PDF generated based on SVG obtain from d03ad98