Add a unique secret token to install instructions

Failing to do so means that if you have multiple stringer installs on the same host, one password will grant you access to all of them.
Remove WIP
Add Victor to contact section
Update README.md
Update README.md
Use openssl for the random token
Add groups for feeds in Fever API
Replaces postgres by mysql2. Ignores database.yml
Adds whenever with schedule
Replaces unicorn by puma
Adds logging for FetchFeeds tasks
Don't check for published date when finding new stories
Adds capo for deployment
Adds airbrake
Adds newrelic
Adds puma capo recipe
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