Initial commit : 1 electrode
Bug correction in color.py

Computed value could be outside range [0, 255]. Now, it won't.
Handle 3 electrodes

The code should be able to handle 3 electrodes for R, G and B. Didn't
test it so far (need 2 other electrodes).
Improved interface and ergonomy
Implemented a calculation of mean value between adjacent times
Merge branch 'master' of https://github.com/Phyks/Touchless3DTracking