Parse html using $.parseHTML.

See #351. In version 0.12.1, cheerio supports `$.parseHTML`. More on `$.parseHTML` from [jQuery's tracker](http://bugs.jquery.com/ticket/11617).

@jugglinmike, what do you think about wrapping the return value of `$.parseHTML` in cheerio inside `$()`? While all tests pass in the browser with an unwrapped `$.parseHTML` call, they fail in cheerio - I get the following output using console.log in the tests:

```
actual:
<div class="listContainer">List Container<div class="list">[object Object][object Object]</div></div>
expected:
<div class="listContainer">List Container<div class="list"><div class="item"><span class="title highlight">Item 1</span></div><div class="item"><span class="title highlight">Item 2</span></div></div></div>
```