added Color::yellow, finished shapes/Box, added a couple boxes to sample scene

git-svn-id: svn://anubis/fart/trunk@121 7f9b0f55-74a9-4bce-be96-3c2cd072584d

util/Color.cc

@@ -6,6 +6,7 @@ const Color Color::white = Color(1, 1, 1);
 const Color Color::red = Color(1, 0, 0);
 const Color Color::green = Color(0, 1, 0);
 const Color Color::blue = Color(0, 0, 1);
+const Color Color::yellow = Color(1, 1, 0);
 
 Color::Color()
 {

util/Color.h

@@ -25,6 +25,7 @@ class Color
         static const Color red;
         static const Color green;
         static const Color blue;
+        static const Color yellow;
 };
 
 Color operator+(const Color & c1, const Color & c2);