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

polkadot/consensus/Cargo.toml

@@ -11,7 +11,7 @@ ed25519 = { path = "../../substrate/ed25519" }
 error-chain = "0.12"
 log = "0.3"
 exit-future = "0.1"
-rhododendron = "0.2"
+rhododendron = "0.3"
 polkadot-api = { path = "../api" }
 polkadot-availability-store = { path = "../availability-store" }
 polkadot-parachain = { path = "../parachain" }