First pass at a cellular atomata map generator.
Add map.grid and a make_grid function to make it easier to make
numpy arrays for Map purposes.
Add ca.py to test the generator.
This configuration object can actually apply to all room generators.
Notably: copy the default configuration object before setting it to self.configuration.
- Generate creates rooms and corridors, and apply applies them to a tile grid.
- Add up and down stairs generation to the Room Generators.
- Clean up Room.wall_points and Room.floor_points to make it easier to
write a generic apply() method on RoomGenerator
- Move room generators to map.generators.room
- Move corridor generators to map.generators.corridor
Generators have a generate() method that generates the things they place,
and an apply() method that applies their objects to a grid of tiles.
