#18 wrong include capitalization

[Meir Michanie]

In MotionPerformer.h it should say #include "Arduino.h"
capital letter for A in Arduino.

Compiles after the change in arduino 1.6.4

[Hawk]

I developed the firmware using an eclipse's plag-in, it seems that in both case the compiler run correctly. However, I fixed it with #include "Arduino.h"

The update will be available in the next release.
Thank you.
Francesco