disablePoll in src

Hello, 

I see that your "openzwave.cc" file in the src folder have one line that seems to be weird.
Indeed, the 719 line is :

```
NODE_SET_PROTOTYPE_METHOD(t, "disablePoll", OZW::EnablePoll);
```

But some lines before there is a function called : 
    `Handle<Value> OZW::DisablePoll(const Arguments& args)`
And you do not use this function.

Is it normal ?

Thank's,
ALT
