Add @briefs to the Luna classes.

Yeah...there was a lot. */

src/Sprite.cpp

@@ -1084,6 +1084,7 @@ void Sprite::AddImageCoords( float fX, float fY )
 // lua start
 #include "LuaBinding.h"
 
+/** @brief Allow Lua to have access to the Sprite. */ 
 class LunaSprite: public Luna<Sprite>
 {
 public: