Added multichannels and a simple channel-based bus

src/Interop/Channel/MultiStreamChannel.php

@@ -40,13 +40,16 @@ class MultiStreamChannel implements ChannelInterface
      * {@inheritDoc}
      *
      * @param mixed $data
-     * @return void
+     * @return bool
      */
-    public function send($data)
+    public function send($data):bool
     {
-        foreach ($this->clients as $client) {
-            $client->send($data);
+        foreach ($this->clients as $i=>$client) {
+            if (false === $client->send($data)) {
+                unset($this->clients[$i]);
+            }
         }
+        return true;
     }
 
     /**