update autoloader to consider namespaces for third party libraries: placed and loaded from vendor/namespace/classpath.php

update readability to a newer implementation based on Readability.js (https://github.com/andreskrey/readability.php)
add vendor/Psr/Log interface required for the above

vendor/Psr/Log/LoggerAwareInterface.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace Psr\Log;
+
+/**
+ * Describes a logger-aware instance.
+ */
+interface LoggerAwareInterface
+{
+    /**
+     * Sets a logger instance on the object.
+     *
+     * @param LoggerInterface $logger
+     *
+     * @return void
+     */
+    public function setLogger(LoggerInterface $logger);
+}