westfieldlabs/scally — pull request #79 by AlecRaeside (2014-10-07 17:14:19+00:00)
Title: RFC: Update generate-at-breakpoints mixin

Allow a mix of min and max media queries. eg
```
@include generate-at-breakpoints('.u-position-fixed', (400 max, 401 min, desk max)) {
position: fixed;
}
```

Change max-width media queries generated by the mixin from this format `.u-position-fixed-at-400` to `.u-position-fixed-up-to-400`