Chip-3v0

Hello everyone, here's my humble remix of the Chip-E.

Here are the changes:
- the body:
- the head has been covered by compatible lego plates generated with openscad and the library from projunk
- the base and middle received compatible technic L beams also generated with openscad and the technic L-beam library again from projunk
- a body part has been inserted between the middle and head sections to store an arduino mega
- every section is bound to others with compatible lego technic friction pins (the black ones)
- it has now a nose and the head section has been elevated to receive the LCD replacement.

Now let me introduce the electronic parts:

- the 2 lines LCDs has been replaced by 2 Nokia5110 graphic LCDs (at first, I wasn't sure at first if both could be driven separately)
- an HC-SR04 ultrasound sensor in the middle section for obstacles avoidance and in the future SLAM(Simultaneous Localization And Mapping)
- a HC-06 bluetooth module to use with and