if absolutely nothing has changed, stop calculating more frames

gameOfLife.py

@@ -89,4 +89,6 @@ for frame in range(500):
                 newRow.append(DEAD)
         gameBoardNextStep.append(newRow)
     gameBoard = gameBoardNextStep
+    if(gameBoard == lastGameBoard):
+        break
 writebml.writeBml(animation, '/home/pi/animations/gameOfLife.bml')