Add bravia var

This fixes
```ReferenceError: bravia is not defined
    at Object.<anonymous> (/root/bravia/demo.js:4:1)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)```

demo.js

@@ -1,4 +1,4 @@
-
+var bravia = require('./lib');
 // Accepts two parameters: IP and PSKKey
 
 bravia('192.168.1.100', '0000', function(client) {