remove unused youtube_titles from comments and posts

db/migrate/20120301143226_remove_youtube_titles.rb

+class RemoveYoutubeTitles < ActiveRecord::Migration
+  def self.up
+    remove_column :comments, :youtube_titles
+    remove_column :posts, :youtube_titles
+  end
+
+  def self.down
+    add_column :comments, :youtube_titles, :text
+    add_column :posts, :youtube_titles, :text
+  end
+end
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