Test Config, fixing bug listener symbol vs string.
Implement Ryespy.notifiers, making more classy.

Instead of passing notifiers around (yrgh :| ), use the module.
Extract Ryespy Redis key prefix to Config#redis_prefix_ryespy.

Don't pass the prefix around. It's not a ball.
Refactor RedisConn connection block to check_imap|ftp.

`redis` you shall not pass.
Deprecate check_listener|imap|ftp, extracting to Listener::X#check_all.

Introduce `Listener::X#check_all`, which is called by the main loop
which all things need to be checked and processed. Set up the main
(non-notifier) Redis connection globally, rather than using multiple
connection blocks.
Merge branch 'refactor' into develop