Update source: pull from git

lib/github_app.rb

@@ -0,0 +1,13 @@
+class GithubApp < Sinatra::Base
+  
+  before do
+    @site = Site.first
+  end
+  
+  get '/site/update' do
+    updated = system('git pull')
+    @site.update_attribute(:up_to_date, true) if updated
+    redirect "admin/sites?updated=#{updated}"
+  end
+  
+end