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/NullLogger.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Psr\Log;
+
+/**
+ * This Logger can be used to avoid conditional log calls.
+ *
+ * Logging should always be optional, and if no logger is provided to your
+ * library creating a NullLogger instance to have something to throw logs at
+ * is a good way to avoid littering your code with `if ($this->logger) { }`
+ * blocks.
+ */
+class NullLogger extends AbstractLogger
+{
+    /**
+     * Logs with an arbitrary level.
+     *
+     * @param mixed  $level
+     * @param string $message
+     * @param array  $context
+     *
+     * @return void
+     */
+    public function log($level, $message, array $context = array())
+    {
+        // noop
+    }
+}