Add cellular atomata to the map generator finally!

Use the new map generator mechanism to generate rooms via cellular
atomata. Create a new CellularAtomatonRoomMethod class that uses
the Cellular Atomton class to create a room. Add a FreefromRoom class
that draws a room based on an ndarray of tiles.

Along the way I discovered I have misunderstood how numpy arrays
organize rows and columns. The numpy array creation routines take an
'order' argument that specifies whether arrays should be in C order (row
major) or Fortran order (column major). Fortran order lets you index
arrays with a more natural [x, y] coordinate order, and that's what the
tutorials I've read have shown. So I've been using that. When I was
developing the Cellular Atomaton, I wrote some code that assumed row-
major order. I think I want to move everything to row-major / C-style,
but that will take a bit more time.

ca.py

@@ -26,7 +26,7 @@ def main(argv):
 
     log.init()
 
-    bounds = Rect(Point(), Size(20, 20))
+    bounds = Rect(Point(), Size(60, 20))
 
     config = CellularAtomataMapGenerator.Configuration()
     config.number_of_rounds = args.rounds