TryGhost/Ghost — pull request #1500 by airtonix (2013-11-17 16:28:14+00:00)
Title: expand the sass task to compile theme sass files.

To help promote theme development, I thought it might be good for the gruntfile to compile sass files found in the theme directories.

It's just an idea, but this works for me.

It's assumed that your themes look like:

```
content/
...
themes/
a-theme/
src/
sass/
_colours.sass
_mixins.sass
screen.sass
print.sass
ie.sass
```

And the result is :
```
content/
...
themes/
a-theme/
assets/
css/
screen.css
print.css
ie.css
src/
sass/
_colours.sass
_mixins.sass
screen.sass
print.sass
ie.sass
```