[LuaManager] Added ProductFamily() Lua binding.

Docs/Changelog_sm5.txt

@@ -8,6 +8,10 @@ ________________________________________________________________________________
 StepMania 5.0 $next | 20111xxx
 --------------------------------------------------------------------------------
 
+2011/12/22
+----------
+* [LuaManager] Added ProductFamily() Lua binding. [AJ]
+
 2011/12/17
 ----------
 * [Various] Allow loading of *.jpeg in addition to *.jpg. [AJ]

src/LuaManager.cpp

@@ -962,6 +962,7 @@ void LuaHelpers::PushValueFunc( lua_State *L, int iArgs )
 }
 
 #include "ProductInfo.h"
+LuaFunction( ProductFamily, (RString) PRODUCT_FAMILY );
 LuaFunction( ProductVersion, (RString) PRODUCT_VER );
 LuaFunction( ProductID, (RString) PRODUCT_ID );