yeoman/grunt-usemin — pull request #173 by tinganho (2013-09-08 09:22:09+00:00)
Title: Added support for src attributes

Often in IE 8 when you load some background sized images. You need to use AlphaImageLoader. Though it uses `src` attribute to define the resource url like below:

```css
.some-class {
filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(
src='images/test.jpg',
sizingMethod='scale'
);
}
```

`Grunt-usemin` doesn't support `src`attributes right now. I changed the regex and added some test for it.