[phpdoc] Add API documentation.

This is a starting point to add a documentation of the whole set of APIs and
classes of Predis. The next step will be to actually improve and extend it.

lib/Predis/Options/ClientConnectionFactory.php

@@ -14,8 +14,16 @@ namespace Predis\Options;
 use Predis\IConnectionFactory;
 use Predis\ConnectionFactory;
 
+/**
+ * Option class that returns a connection factory to be used by a client.
+ *
+ * @author Daniele Alessandri <suppakilla@gmail.com>
+ */
 class ClientConnectionFactory extends Option
 {
+    /**
+     * {@inheritdoc}
+     */
     public function validate($value)
     {
         if ($value instanceof IConnectionFactory) {
@@ -26,6 +34,9 @@ class ClientConnectionFactory extends Option
         }
     }
 
+    /**
+     * {@inheritdoc}
+     */
     public function getDefault()
     {
         return new ConnectionFactory();