Arvados

puma also shouldn't recover from out of memory conditions, it should just die. That way runit will restart it.

2014-07-02_18:28:36.48001 * Version 2.8.2 (ruby 2.1.1-p76), codename: Sir Edmund Percival Hillary
2014-07-02_18:28:36.48002 * Min threads: 0, max threads: 64
2014-07-02_18:28:36.48002 * Environment: production
2014-07-02_18:28:41.48719 * Listening on tcp://127.0.0.1:8100
2014-07-02_18:28:41.49459 Use Ctrl-C to stop
2014-07-08_16:16:41.99895 /var/www/4xphq.arvadosapi.com/releases/20140702182803/lib/eventbus.rb:206:in `wait_for_notify': failed to allocate memory (NoMemoryError)
2014-07-08_16:16:42.00571   from /var/www/4xphq.arvadosapi.com/releases/20140702182803/lib/eventbus.rb:206:in `block (3 levels) in on_connect'
2014-07-08_16:16:42.00572   from /var/www/4xphq.arvadosapi.com/releases/20140702182803/vendor/bundle/ruby/2.1.0/gems/activerecord-3.2.17/lib/active_record/connection_adapters/abstract/connection_pool.rb:129:in `with_connection'
2014-07-08_16:16:42.00573   from /var/www/4xphq.arvadosapi.com/releases/20140702182803/lib/eventbus.rb:195:in `block (2 levels) in on_connect'

Reviewing de3bb6c. There's a small typo in your comments for push_events where it says "it may nil" (missing a verb). But this is a good to merge, thanks.