Insertion baseball: fix a bug occuring when the hole is already on position 0
Allow to specify the positions to use in the baseballworld constructor
add a world with the hole in the first positino to make sure that the students don't miss that case
reliably count the amount of exercises we have
more verbose error message to get informative bug reports
pythonize the baseball world
Merge branch 'master' of github.com:oster/JLM