add setting for tinymce config

app/assets/javascripts/tinymce_orbit.js.erb

@@ -25,6 +25,8 @@ function load_tinymce() {
     // external_image_list_url : "js/image_list.js",
     // media_external_list_url : "js/media_list.js"
 
+    content_css: "<%= asset_path('tinymce_orbit.css') %>",
+
     // Style formats
     style_formats : [
       {title : 'Bold text', inline : 'b'},