Fix asset precompilation issues.

lib/discourse_sass_importer.rb

@@ -4,7 +4,7 @@
 class DiscourseSassImporter < Sass::Importers::Filesystem
   GLOB = /\*|\[.+\]/
 
-  def initialize(root)
+  def initialize(*args)
     @root = Rails.root.join('app', 'assets', 'stylesheets').to_s
     @same_name_warnings = Set.new
   end

lib/tasks/assets.rake

@@ -16,6 +16,9 @@ task 'assets:precompile:before' do
   # let's make precompile faster using redis magic
   require 'sprockets'
   require 'digest/sha1'
+  require_dependency 'discourse_sass_importer'
+
+  Sprockets::SassImporter = DiscourseSassImporter
 
   module ::Sprockets