added a slightly modified version of Prim maze generation
We now can generate an infinite number of random mazes thanks to the 1950's.  The algorithm was slightly modified, instead of getting removed from active list when position in front of maze is already in it, it gets removed when all adjacent positions are already in the maze.  Not sure if i'm going to fix it or not.  It seems is a little bit simplistic for this way...
Implemented more interesting robot search pattern
Better than just bouncing back and forth.  Turns right whenever there is an open space to it's right.