old_contents: //= require jquery
  //= require jquery.ui.all
  //= require jquery_ujs
  //= require jquery-fileupload/basic
  //= require lightbox
  //= require custom_selector
  //= require custom_file_input
  //= require lazy/admin
  
new_contents: //= require jquery
  //= require jquery.ui.all
  //= require jquery_ujs
  //= require jquery-fileupload/basic
  //= require lightbox
  //= require custom_selector
  //= require custom_file_input
  //= require tinymce-rails
  //= require lazy/admin
  
subject: Add tinymce js to admin