Merge branch 'master' into miner-spec-refact

Conflicts:
	ethcore/src/client/client.rs
	ethcore/src/client/mod.rs
	ethcore/src/client/test_client.rs
	miner/src/miner.rs

sync/src/tests/chain.rs

@@ -16,7 +16,6 @@
 
 use util::*;
 use ethcore::client::{BlockChainClient, BlockId, EachBlockWith};
-use io::SyncIo;
 use chain::{SyncState};
 use super::helpers::*;
 

sync/src/tests/helpers.rs

@@ -148,7 +148,7 @@ impl TestNet {
 		let mut total_steps = 0;
 		while !self.done() {
 			self.sync_step();
-			total_steps = total_steps + 1;
+			total_steps += 1;
 		}
 		total_steps
 	}