flyerhzm/css_sprite — pull request #22 by Jerskouille (2014-01-14 10:54:57+00:00)
Title: Remove deprecated second parameter of asset_url

This PR removes the warning from Rails 4 because of deprecated use of asset_url with 2 arguments.

If this doens't suits you, a new config option could do the job, but I'm going with the idea that no new project will use Rails 3, or if it does, that it can work without asset_url.