Slash Authorities for irrefutable misbehavior (#84)

* double-commit and prepare misbehavior

* get misbehavior on completion

* collect misbehavior on drop, not only on success

* kill unused transaction_index field

* add primitive misbehavior report type

* add misbehavior report transaction

* store prior session

* fix set_items

* basic checks for misbehavior reports

* crate for substrate bft misbehavior checking

* integrate misbehavior check crate

* fix comment

* new wasm binaries

* fix hash in test

* import misbehavior transactions into queue

* fix test build

* sign on digest and full proposal when proposing

* detect proposal misbehavior

* fix fallout

* restore balance/bondage types

substrate/Cargo.lock

@@ -1044,6 +1044,7 @@ dependencies = [
  "ed25519 0.1.0",
  "error-chain 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "polkadot-api 0.1.0",
  "polkadot-collator 0.1.0",
@@ -1097,6 +1098,7 @@ dependencies = [
  "rustc-hex 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "substrate-codec 0.1.0",
  "substrate-keyring 0.1.0",
+ "substrate-misbehavior-check 0.1.0",
  "substrate-primitives 0.1.0",
  "substrate-runtime-io 0.1.0",
  "substrate-runtime-std 0.1.0",
@@ -1524,6 +1526,17 @@ dependencies = [
  "hex-literal 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "substrate-misbehavior-check"
+version = "0.1.0"
+dependencies = [
+ "substrate-bft 0.1.0",
+ "substrate-codec 0.1.0",
+ "substrate-keyring 0.1.0",
+ "substrate-primitives 0.1.0",
+ "substrate-runtime-io 0.1.0",
+]
+
 [[package]]
 name = "substrate-network"
 version = "0.1.0"