Adding the pimotion blog post

The pimotion project is a Python application running on the Raspberry PI leveraging the camera module to detect motion. It integrates with CloudApp and M2X to publish the captured motion stills to your M2X device stream.
This doesn't add any more information than the article title. I would elaborate a bit on what's in the article, something like this:

> Explore motion detecting using two methods; manual calculations and H.264 motion vectors