Fix for companies dates

Hi,

Just playing around with the gem I noticed it doesn't parse non-english dates, for example:

```
<abbr class="dtstart" title="2010-02-01">febrero de 2010</abbr>
<abbr class="dtend" title="2010-08-01">agosto de 2010</abbr>
```

So instead of using node.at('.dtend').text I went for node.at('.dtend')['title'] as title in abbr seems to contain the date.

Let me know what you think,