porada/middleman-autoprefixer — pull request #5 by vast (2014-04-21 16:07:32+00:00)
Title: Depend on middleman-core, middleman-sprockets instead of full middleman package

Middleman-autoprefixer actually requires only middleman-core and middleman-sprockets. Full middleman package (haml, sass, compas, ...) is required only for testing.