2014-02-25  David Feng <davidxifeng@gmail.com>

             * cbits/pbc-lua.c: (bugfix) revert last commit to fix the bug

             * src/Scripting/Lua/Pbc.hs: (bugfix) call c_luaopen_pbc with cpcall


2014-02-24  David Feng <davidxifeng@gmail.com>

             * cbits/pbc-lua.c: add the missing lua_pop call after luaL_register
             called to clear the lua stack