add later / snap on ESC cover

I found those ESC covers for 10A LittleBees and resized them to find the perfect fit for the RaceFlight 30A ESC (BumpBee30A)... I like the design since printed in TPU I can just snap them onto my already solder ESCs without having to desolder anything :)

04.02.2017
140% is a bit big, printing 120% right now
so I made more changes (a few % longer, a few % narrower) and I think now it fits perfectly :)

05.02.2017
I am happy now! Made a quad pack STL for easy printing and uploaded a timela