Add functions haveYouMet() and haveYouTried() for setting nested values

Add functions haveYouMet() and haveYouTried() for setting nested values.
I have also updated the test cases and readme file.

Usage:

```js
Bro(obj).haveYouMet('ted.mosby', 'the architect');
console.log(obj.ted.mosby); // 'the architect'
```

Or,
```js
Bro(ted).haveYouTried('suit.up', function(){ return 'suited up Ted'; });
ted.suit.up(); // 'suited up Ted'
```