module Sprockets::Mime

def read_file(filename, content_type = nil)

encoding.
Returns String file contents transcoded to UTF-8 or in its external

content_type - String MIME type
filename - String path

Public: Read file on disk with MIME type specific encoding. 
def read_file(filename, content_type = nil)
  data = File.binread(filename)
  if detect = mime_type_charset_detecter(content_type)
    detect.call(data).encode(Encoding::UTF_8, :universal_newline => true)
  else
    data
  end
end