Merge branch 'rs-no-killers-in-development' into 'master'

Disable Unicorn::WorkerKiller in non-production environments

Addresses internal https://dev.gitlab.org/gitlab/gitlabhq/issues/2281

See merge request !729

config.ru

@@ -2,11 +2,14 @@
 
 if defined?(Unicorn)
   require 'unicorn'
+
+  if ENV['RAILS_ENV'] == 'production' || ENV['RAILS_ENV'] == 'staging'
     # Unicorn self-process killer
     require 'unicorn/worker_killer'
 
     # Max memory size (RSS) per worker
     use Unicorn::WorkerKiller::Oom, (200 * (1 << 20)), (250 * (1 << 20))
+  end
 end
 
 require ::File.expand_path('../config/environment',  __FILE__)