Complete reorganization of the Predis\Connection namespace.

* Renamed SingleConnectionInterface to NodeConnectionInterface since
  this name is better and makes even more sense in the context of
  cluster and replication scenarios.

* Moved specialized aggregate connections (the ones implementing both
  predis and redis cluster and master/slave replication) in a newly
  created Predis\Connection\Aggregate sub-namespace.

* Removed the "Connection" part from names of aggregate connection
  interfaces in the Predis\Connection\Aggregate sub-namespace.

* Changed "Composable" to "Composite" in the name of interfaces and
  classes that can use pluggable protocol processors.

lib/Predis/Connection/NodeConnectionInterface.php

@@ -0,0 +1,58 @@
+<?php
+
+/*
+ * This file is part of the Predis package.
+ *
+ * (c) Daniele Alessandri <suppakilla@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Predis\Connection;
+
+use Predis\Command\CommandInterface;
+
+/**
+ * Defines a connection used to communicate with a single Redis node.
+ *
+ * @author Daniele Alessandri <suppakilla@gmail.com>
+ */
+interface NodeConnectionInterface extends ConnectionInterface
+{
+    /**
+     * Returns a string representation of the connection.
+     *
+     * @return string
+     */
+    public function __toString();
+
+    /**
+     * Returns the underlying resource used to communicate with Redis.
+     *
+     * @return mixed
+     */
+    public function getResource();
+
+    /**
+     * Returns the parameters used to initialize the connection.
+     *
+     * @return ParametersInterface
+     */
+    public function getParameters();
+
+    /**
+     * Pushes the given command into a queue of commands executed when
+     * establishing the actual connection to Redis.
+     *
+     * @param CommandInterface $command Instance of a Redis command.
+     */
+    public function addConnectCommand(CommandInterface $command);
+
+    /**
+     * Reads a response from the server.
+     *
+     * @return mixed
+     */
+    public function read();
+}