fix old migration file names

db/migrate/20140617183704_create_comments.rb

@@ -0,0 +1,13 @@
+class CreateComments < ActiveRecord::Migration
+  def change
+    create_table :comments do |t|
+      t.text       :content
+
+      t.references :user_author
+      t.references :user_editor
+      t.references :blogpost
+
+      t.timestamps null: true
+    end
+  end
+end