def pack_stylesheets(package, variant=nil, asset_url=nil)
      compressor.compress_css(package_for(package, :css)[:paths], variant, asset_url)
    end
def pack_stylesheets(package, variant=nil, asset_url=nil)
      compressor.compress_css(package_for(package, :css)[:paths], variant, asset_url)
    end
Return the compressed contents of a stylesheet package.