Added the texture of two remaining directions of ObjectPlayer1Switch.
Added the handling of the two remaining directions.
Updated indexes of directions in ObjectPlayer1Switch generation of _mapgen__generate_roads().
Updated ObjectPlayer1Switch generation in _mapgen__generate_roads() to check for the two new directions.
Added two new road blocks in the two new directions.
Merge pull request #13 from gheja/dev-directions

Implemented the two remaining directions (fixes #6, fixes #7)