And then I thought: those guys are so smart, I bet they really did it.
So I tried it, and it works! http://rbcranes.heroku.com/
I heart Heroku :-)
And a month later write support for svn: https://github.com/blog/644-subversion-write-support
About 25 years ago (gosh that's a long time), I had Atari Logo on the Atari 800 and was able to remember enough from then to get a filled circle:
make "x 0 repeat 100 [make "x :x+.01 repeat 360 [fd :x rt 1]]