I am sure we can make a real-time dashboard for viewing Raspberry PI values, and in the following weeks also store them with the bucket features. Take a look to the dashboards feature at this video:
It should be quite easy to integrate with Raspberry if we are able to read sensor values through WiringPi. I would start a simple code using WiringPi to read the sensors you want to connect. It should be quite similar to Arduino. Once we are able to read sensors throught C++, then we can easily add this functionality to the thinger.io code, were I can help you.
Let me know any progress you make, and I can help you in the progress