Refactored generation of unique tags, URIs and object URLs into own classes,

as well as formatting of content

spec/models/media_attachment_spec.rb

@@ -1,5 +1,5 @@
 require 'rails_helper'
 
 RSpec.describe MediaAttachment, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+
 end