Improve beacon node logging (#660)

* Squish prev commits into a single atop master

* Enable http and ws during testing

* Checkout clobbered files from master

* Further un-clobber rest_api changes

* Tidy formatting

* Do rust-fmt's job for it :|

beacon_node/client/src/lib.rs

@@ -1,6 +1,7 @@
 extern crate slog;
 
 mod config;
+mod notifier;
 
 pub mod builder;
 pub mod error;