deploy.rb.erb in negroku-1.1.7

- old
+ new

@@ -16,5 +16,9 @@
 # Database
 # set :migrate_env,    "migration"
 
 # Unicorn
 set :unicorn_workers, 1
+
+# Cleanup after deploy
+set :keep_releases, 3
+after "deploy", "deploy:cleanup"
\ No newline at end of file