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> Is there are a guide somewhere on converting modules written in C for
> Lua 5.1 to Lua 5.2?

There is no guide AFAIK, but I've been converting my modules at and it's been quite easy.
The changes are almost always these:

-- luaL_setmetatable is new in 5.2:

<  luaL_getmetatable(L,MYTYPE);
<  lua_setmetatable(L,-2);
>  luaL_setmetatable(L,MYTYPE);

-- C modules don't set globals
<  lua_setglobal(L,MYNAME);
<  luaL_register(L,MYNAME,R);
>  luaL_setfuncs(L,R,0);

-- use either luaL_setfuncs or luaL_newlib depending on whether your module
-- table is the metatable for its objects (that's the lazy way I do it)
<  luaL_register(L,MYNAME,R);
>  luaL_newlib(L,R);