Various fixes and updates.

games.png
+ Updated to include borders.

index.html
+ Updated to add borders.
+ Updated to add list of key commands.
- Fixed bug where it was drawing sunglasses smiley on player wins but immediately drawing over it with regular smiley.
- Fixed bug where it wasn't resizing menubar at all and wasn't resizing minefield correctly.
Merge branch 'master' of https://github.com/alistairmcmillan/JSMinesweeper