Fixed bug parsing img tags in the html

Please check this change proposal, this fixes an important bug I found on my project.

The problem is that when it parses something like:
```html
<html>
<img src="file:///namehere.jpg" width="200" />
</html>
```

It was taking the file path as 'file:///namehere.jpg" width="200" /'.

That's because the regular expression used was looking for the end of the ```html<img>``` tag instead of the end of the quoted text.

Now it would retrieve:

'/namehere.jpg'