tostring does not obey __name.

[SquidDev]

The following code should print out abc: 0xffffffff

print(tostring(setmetatable({}, {__name="abc"})))

However, it instead prints out table: 0xffffffff. This is going to be a really nasty change to make here, as we now need to thread LuaState to all the toLuaString methods (though I guess we need that for #66 too).