Add 4×4 mode.

Signed-off-by: cyberzhg <cyberzhg@gmail.com>
Fix typo.

Signed-off-by: cyberzhg <cyberzhg@gmail.com>
Merge branch 'redeo'

Conflicts:
	Rodeo/index4.html

Signed-off-by: cyberzhg <cyberzhg@gmail.com>
Merge branch 'master' into gh-pages