inital commit
Add error handling for scrolling off screen. Add trajectories
Change cell insertion to modal paradigm
Add cursor_position as a property
Added a board class and tests
refactored movements and added delete command
Refactor. Move screen into it's own class
Add empty neighbours property to Board
Add the step function
Relative motions to allow for infinite board
Added README
reorg directory structure
Merge branch 'master' of https://github.com/lodin/ProgrammingEtudes
Unify READMEs