added before_deploy and after_deploy tasks

lib/tasks/after_deploy.rake

+desc "revert custom landing page commit after heroku san deploys"
+task :after_deploy => :environment do
+
+  # Perform this task only if custom landing page is not present in app/views/home/_show.html.haml
+  if File.exist?(File.join(Rails.root, "app", "views", "home", "_show.html.haml")) && system("git log | head -5 | grep 'custom\ landing\ page'")
+    puts "-----> resetting HEAD before custom landing page commit"
+
+    system("git reset --hard HEAD^") ? true : fail
+
+    puts "-----> done"
+  end
+
+end

lib/tasks/before_deploy.rake

+desc "include custom landing page before heroku san deploys"
+task :before_deploy => :environment do
+
+  # Perform this task only if custom landing page is not present in app/views/home/_show.html.haml
+  if File.exist?(File.join(Rails.root, "app", "views", "home", "_show.html.haml"))
+    puts "-----> custom landing page detected..."
+
+    puts "-----> including custom landing page in a temp commit"
+
+    system("git add app/views/home/_show.html.haml -f") ? true : fail
+    system("git commit -m 'adding custom landing page for heroku'") ? true : fail
+
+    puts "-----> done"
+  end
+
+end