Enable support for lazy images

@pgilad I came across a very specific problem in the project I'm working on, I'm loading some images through lazy-load, so if you agree, I thought about creating a small interface to work with images, with this I can create a regex to collect the url of the informed attribute, something like:

```javascript
images: {
    lazyLoadAttribute: 'data-src'
}
```

What do you think?
