yeoman/generator-ember — pull request #191 by Globegitter (2014-02-28 07:37:03+00:00)
Title: Replaced cssmin with csso for improved css minification.

Title says it all really. I have tested it in one project and it is giving me between 4-50kb of file size reduction for my css file.
Seems to me like a free win to implement. What do you think?