Adds migrations for renaming and new flagging field

* inappropiate_flags table becomes flags
* [comments|debates].archived_at becomes flag_ignored_at
* Add new [comments|debates].hide_reviewed_at

db/migrate/20150827080624_rename_inappropiate_flags_as_flags.rb

@@ -0,0 +1,5 @@
+class RenameInappropiateFlagsAsFlags < ActiveRecord::Migration
+  def change
+    rename_table :inappropiate_flags, :flags
+  end
+end

db/migrate/20150827080641_rename_archived_at_to_flag_ignored_at_in_comments_and_debates.rb

@@ -0,0 +1,6 @@
+class RenameArchivedAtToFlagIgnoredAtInCommentsAndDebates < ActiveRecord::Migration
+  def change
+    rename_column :comments, :archived_at, :flag_ignored_at
+    rename_column :debates, :archived_at, :flag_ignored_at
+  end
+end

db/migrate/20150827080701_add_hide_reviewed_at_to_comments_and_debates.rb

@@ -0,0 +1,6 @@
+class AddHideReviewedAtToCommentsAndDebates < ActiveRecord::Migration
+  def change
+    add_column :debates, :hide_reviewed_at, :datetime
+    add_column :comments, :hide_reviewed_at, :datetime
+  end
+end