Completion of RiskBoard.cpp

I added all of the country names and borders so the whole board should
be filled out.  There are some places where it is difficult to tell on 
our picture if the countries share a border.  When I was unsure I 
referenced this picture: http://boardgamegeek.com/image/365731/vanderdecken?size=large

If you disagree with these borders they can be changed just make sure
to delete them from both countries. (Scandinavia and Northern Europe
are the hardest to tell if they are touching or not. See reference map.)