Merge branch 'master' into sync_v2

db/src/storage.rs

@@ -646,6 +646,7 @@ impl BlockStapler for Storage {
 		}
 		try!(context.apply(&self.database));
 
+		try!(self.database.flush());
 		trace!(target: "db", "Best block now ({}, {})", &new_best_hash.to_reversed_str(), &new_best_number);
 		// updating locked best block
 		*best_block = Some(BestBlock { hash: new_best_hash, number: new_best_number });