Add url-encoded tags recognition

Need to be able to recognize url-encoded xml tags, turning this:

``` html
&lt;a&gt;1&lt;b&gt;&lt;c&gt;23&lt;/c&gt;&lt;d&gt;4&lt;/d&gt;&lt;/b&gt;&lt;/a&gt;
```

into this:

``` xml
<a>1
    <b>
        <c>23</c>
        <d>4</d>
    </b>
</a>
```

and then fuzz it.
