Rewards and slashing, early-exit of bad sessions (#234)

* Recompile runtime.

* Introduce and enforce block time

* Introduce early session ending.

* Report most of staking module

* rewards, proper early exit and slashing

* Fix build & session logic, introduce tests

* Fixed staking tests.

* Initial test for reward

* Fix test

* Tests for slashing

* Update/fix preset configs

* Fix some tests.

* Fix some staking tests

* Minor fix

* minor cleanups

* Fix build

* Rename timestamp::Value -> Moment

* Require final block of session to be timely

polkadot/api/src/full.rs

@@ -112,7 +112,7 @@ impl<B: LocalBackend<Block>> PolkadotApi for Client<B, LocalCallExecutor<B, Nati
 	}
 
 	fn timestamp(&self, at: &CheckedId) -> Result<Timestamp> {
-		with_runtime!(self, at, ::runtime::Timestamp::now)
+		with_runtime!(self, at, ::runtime::Timestamp::get)
 	}
 
 	fn evaluate_block(&self, at: &CheckedId, block: Block) -> Result<bool> {
@@ -216,11 +216,13 @@ mod tests {
 			session: Some(SessionConfig {
 				validators: validators(),
 				session_length: 100,
+				broken_percent_late: 100,
 			}),
 			council: Some(Default::default()),
 			democracy: Some(Default::default()),
 			parachains: Some(Default::default()),
 			staking: Some(Default::default()),
+			timestamp: Some(Default::default()),
 		};
 
 		::client::new_in_mem(LocalDispatch::new(), genesis_config.build_storage()).unwrap()