Documentation spelling

Hi,

I tried your documentation, but it failed and after checking I realized that your

``` javascript
var liveDb = new LivePG('postgres://user:pass@host/db', 'myapp');
```

should be

``` javascript
var liveDb = new LivePg('postgres://user:pass@host/db', 'myapp');
```

Figured, may help from deterring people who just copy + paste and then leave when it "breaks".

Thanks for the package :)
