Fixed examples to have proper include pathing

When I would run 
```
node .\examples\counter\counter.js
```
I would get this error
```

module.js:340
    throw err;
          ^
Error: Cannot find module 'mkdirp'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (C:\nodetoys\node-persist.js:8:14)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)
```

This changes the reference of node-persist to be the proper directory