Reload unicorn with USR2

diaspora/files/diaspora-web.service

@@ -8,6 +8,7 @@ User={{ diaspora.user.username }}
 Environment=RAILS_ENV={{ diaspora.configuration.server.rails_environment }}
 WorkingDirectory={{ diaspora.install_path }}
 ExecStart=/bin/bash -lc "bin/bundle exec unicorn -c config/unicorn.rb -E {{ diaspora.configuration.server.rails_environment }}"
+ExecReload=/bin/kill -USR2 $MAINPID
 Restart=always
 
 [Install]