IPC (feature-gated) (#1654)

* moving ipc deriving to trait

* refactoring of the client

* all compiled

* proved all working

* warnings purged

* allow hypervisor to specify initialization payload in two ways

* using binary initialisation payload for sync

* some docs

* logger to separate crate

* log settings for sync bin

* forwarding logging arguments to the sync

ethcore/src/client/client.rs

@@ -235,8 +235,8 @@ impl Client {
 	}
 
 	/// Adds an actor to be notified on certain events
-	pub fn add_notify(&self, target: &Arc<ChainNotify>) {
-		self.notify.write().push(Arc::downgrade(target));
+	pub fn add_notify(&self, target: Arc<ChainNotify>) {
+		self.notify.write().push(Arc::downgrade(&target));
 	}
 
 	fn notify<F>(&self, f: F) where F: Fn(&ChainNotify) {