Patch to fix a warning

Hello,

I'm sending you a patch to fix a warning on 64bit linux. 
It looks like the mpl::size() function returns 'long int', 
but the lua_concat function is taking 'int' for the second parameter.

Best regards,
Teodor


Index: luabind/detail/format_signature.hpp
===================================================================
--- luabind/detail/format_signature.hpp (revision 232)
+++ luabind/detail/format_signature.hpp (working copy)
@@ -139,7 +139,7 @@
     );
     lua_pushstring(L, ")");
 
-    lua_concat(L, mpl::size<Signature>() * 2 + 2);
+    lua_concat(L, static_cast<int>(mpl::size<Signature>()) * 2 + 2);
 }
 
 }} // namespace luabind::detail

------------------------------------------------------------------------------
ThinkGeek and WIRED's GeekDad team up for the Ultimate 
GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the 
lucky parental unit.  See the prize list and enter to win: 
http://p.sf.net/sfu/thinkgeek-promo