Fixed documenation on pos
Small doc fixes
Merge pull request #3 from takikawa/master

Documentation improvements
Added for/draw
Added rainbow circle
Added the missing square puzzle
in the missing square puzzle, the grid now shows through the pieces
Add info.rkt file so that docs render on setup
Remove ragg dependency by not compiling todo
Add missing build-dep in info.rkt
Remove zo/dep files from git repo