* Refactored post history. Each post now has a single history record. This history record has multiple revisions, serialized as JSON in a text field.

app/controllers/post_histories_controller.rb

@@ -0,0 +1,6 @@
+class PostHistoriesController < ApplicationController
+  def index
+    @search = PostHistory.search(params[:search])
+    @histories = @search.paginate(:page => params[:page], :per_page => 20)
+  end
+end