Operational changes and perf updates

This had a lot of thrashing as we adapted it to run in our new infrastructure. Generally, we need:

• it to work on ECS with a Docker-based deployu
• to use resque-scheduler instead of Heroku scheduler (since the later doesn't exist on AWS :) (See #66, #63, #61, #59, #58, #57)
• Update dependent gems (see #60 and #68 )
• Reduce auto-refresh in the UI. On the failed page it no longer auto-refreshes, and on other pages, it does so only once per minute (see #70 )