Update: readme; imagemick dependency.
Fix: PixelAccess bug; wrong function args.

Bad arguments were passed to _drawX(). Also, the bash script not exits gracefully when a path is not found.
Update: readme; minor markdown fix.
Update: Added sample output files.
Merge branch 'master' of https://github.com/scharissis/maze-solver-python
Update: readme; added images.