+ (games) An acrophobia game for your channel

Acrophobia for IRC. More information on acrophobia is available
on wikipedia. Includes a Hall of Fame (scoreboard).
Unfortunately doesn't work on a per-channel basis since some
secrecy is required.

Signed-off-by: Andy Hill <hillad@gmail.com>
Merge pull request #2 from andyhky/andyhky_add_acrophobia

Add acrophobia plugin.