OpenTrons eppendorf tube transfer tool

A quick prototype to demonstrate that liquid-handling robots can be given basic tools, even if they aren't designed for this. This is a tool for carrying eppendorf tubes that fits onto the end of a P1000 pipette like a tip.
Video: https://www.youtube.com/watch?v=Jm4h6dKwD3c&feature=youtu.be
It is picked up from its base, (which is designed to sit on a 96-well plate - glue on if using properly) and used to move eppendorf tubes from one spot to another (they will need to have quite a large amount of their height exposed so that the grabber can get around them). The tool is then ejected back onto the base for re-use.
This would need a nice extension to the Python library - I did everything with 'points' for the demo.
Why? Because we can, and because one day it might be useful for:
- centrifuging
- heat shock
- old-style water bath PCR?!