do one thing, do it well

this script should only be used to solve the puzzle and print the solution if
one is found.

I will do this by returning 0, and printing the solution to stdout, or
returning 1 on failure

bin/solve_maze.py

@@ -1,6 +1,5 @@
 import sys
 
-from maze import parse_maze, CS235Maze
+from maze import parse_maze
 
 m = parse_maze(sys.stdin.read())
-print CS235Maze(m)