Update README.md

Add link to Github page.
Changed default resolution.
Writer can be stopped and restarted

Partly rewrote the writer. Signals are now handed over by a seperate
pipe. Can be started, stopped and closed. Uses timestamp as filename.
Updated chatter frame scan to new instructions
Adjustments to run on OSX 10.6
Fixed crash on pin update when not connected
Intermediate: Saving templates 1