d-i/half-pipe — pull request #102 by bronson (2014-07-24 10:58:27+00:00)
Title: make cssmin operate on the generated file

Both sass and less put their results in dirs.tmp. That's also where the copy:finalize task expects to find the final result. Therefore, make cssmin operate on the main.css file in-place.

Without this change, cssmin always seems to complain:

```
Running "cssmin:compress" (cssmin) task
>> Destination not written because minified CSS was empty.
```