add comments to scoreboard, and change UI on scoreboard
Merge branch 'master' of https://github.com/seanjosephwu/nonogramFun
Center panel

The best I could do is put the gravity to center, and use some margins for left/right adjustment. 14x14 works perfect, but 5x5 and 10x10 is still a little bit to the left of the screen, since this is a horizontal view.
front-end tests all done