First stab at new user education - configurable messages that pop up on a user's first

few posts/topics.

app/controllers/education_controller.rb

@@ -0,0 +1,17 @@
+class EducationController < ApplicationController
+
+  before_filter :ensure_logged_in
+
+  def show
+    raise Discourse::InvalidAccess.new unless params[:id] =~ /^[a-z0-9\-\_]+$/
+    raise Discourse::NotFound.new unless I18n.t(:education).include?(params[:id].to_sym)
+    
+    education_posts_text = I18n.t('education.until_posts', count: SiteSetting.educate_until_posts)
+
+    markdown_content = MultisiteI18n.t("education.#{params[:id]}", 
+                                       site_name: SiteSetting.title, 
+                                       education_posts_text: education_posts_text)
+    render text: PrettyText.cook(markdown_content)
+  end
+
+end