[live] Adds logging for FetchFeeds tasks
[live] Don't check for published date when finding new stories
[live] Adds capo for deployment
[live] Adds airbrake
[live] Adds newrelic
[live] Adds puma capo recipe
[live] Set puma_cmd in capistrano to use the config and start one thread with one worker.

The thread/worker config is a workaround for newrelic:
https://github.com/puma/puma/issues/128