Vote out offline authorities (#524)

* notify when an authority appears to have missed their block

* Runtime API

* offline tracker

* Move to consensus

* generating reports of offline indices

* stubbed-out evaluation logic

* Slashing data pathwat

* usize -> u32

* Slash bad validators.

* update to rhododendron 0.3

* fix compilation of polkadot-consensus

* Support offline noting in checked_block

* include offline reports in block authorship voting

* do not vote validators offline after some time

* add test for offline-tracker

* fix test build

* bump spec version

* update wasm

* Only allow validators that are possible to slash

* Fix grumble

* More idiomatic

* New Wasm.

* update rhododendron

* improve logging and reduce round time exponent

* format offline validators in ss58

substrate/demo/runtime/src/lib.rs

@@ -121,6 +121,7 @@ impl Convert<AccountId, SessionKey> for SessionKeyConversion {
 }
 
 impl session::Trait for Concrete {
+	const NOTE_OFFLINE_POSITION: u32 = 1;
 	type ConvertAccountIdToSessionKey = SessionKeyConversion;
 	type OnSessionChange = Staking;
 }