[MazeSolver] Right hand wall solution

Done in 1 h in F#
(I did not know yet how to implement interfaces in F#!)
4 unit tests only
4 lines of code in YourTurn()
[Git] Ignore orig files
[MazeSolver] Refactoring
[MazeSolver] Add step back and no wall unit tests
[MazeSolver] Add step back in corridor test
[MazeSolver] Add step back in corridor with left exit test
[MazeSolver] Add init twice unit test
Merge pull request #12 from dedale/master

[MazeSolver] Right hand wall solution