Now AR marker files are included in our repo, users need not to download them separately.
Thus, I changed the README file.

I also added GIF files for patterns, so that users can print them out and use.
I did big modification (or say, refactoring)  so that code will be more separate (more object-oriented),
and game will be easier to play.
Since the changes range so widely on whole codes, I can't separate the commits.

It include #4, #5 and #6.

For #6, I used the "life" of marker which indicate how many times the marker is detected successfully.
Now I think, there are less "false positive".

Close #4,#5,#6