westfieldlabs/scally — pull request #128 by AlecRaeside (2014-10-27 21:00:52+00:00)
Title: Fix heading mixin

List was not being joined correctly. Output is now
```
h1, .h1, h2, .h2, h3, .h3, hr, p {
margin-bottom: 1.5rem;
}
```