Consensus message buffering and more (#114)

* CLI options and keystore integration

* Replace multiqueue with future::mpsc

* BFT gossip

* Revert to app_dirs

* generate_from_seed commented

* Refactor event loop

* Start consensus by timer

* Message buffering

* Minor fixes

* Work around duty-roster issue.

* some more minor fixes

* fix compilation

* more consistent formatting

* make bft input stream never conclude

* Minor fixes

* add timestamp module to executive

* more cleanups and logging

* Fixed message propagation

substrate/polkadot/runtime/src/lib.rs

@@ -146,7 +146,7 @@ pub type UncheckedExtrinsic = generic::UncheckedExtrinsic<AccountId, Index, Call
 pub type Extrinsic = generic::Extrinsic<AccountId, Index, Call>;
 /// Executive: handles dispatch to the various modules.
 pub type Executive = executive::Executive<Concrete, Block, Staking,
-	((((((), Parachains), Council), Democracy), Staking), Session)>;
+	(((((((), Parachains), Council), Democracy), Staking), Session), Timestamp)>;
 
 impl_outer_config! {
 	pub struct GenesisConfig for Concrete {

substrate/polkadot/runtime/src/parachains.rs

@@ -44,7 +44,7 @@ impl<T: Trait> Module<T> {
 	pub fn calculate_duty_roster() -> DutyRoster {
 		let parachain_count = Self::count();
 		let validator_count = <session::Module<T>>::validator_count();
-		let validators_per_parachain = (validator_count - 1) / parachain_count;
+		let validators_per_parachain = if parachain_count != 0 { (validator_count - 1) / parachain_count } else { 0 };
 
 		let mut roles_val = (0..validator_count).map(|i| match i {
 			i if i < parachain_count * validators_per_parachain =>