Remove horribly annoying 5.3 StreamInterface extends bug

This was needed because you could not implement two interfaces with a
shared method. In 5.3.8+ it is fixed, so the hack is no longer needed in
5.4.0+.

ReadableStreamInterface.php

@@ -10,10 +10,11 @@
  * @event error
  * @event close
  */
-interface ReadableStreamInterface extends StreamInterface
+interface ReadableStreamInterface extends EventEmitterInterface
 {
     public function isReadable();
     public function pause();
     public function resume();
     public function pipe(WritableStreamInterface $dest, array $options = array());
+    public function close();
 }

WritableStreamInterface.php

@@ -10,9 +10,10 @@
  * @event close
  * @event pipe
  */
-interface WritableStreamInterface extends StreamInterface
+interface WritableStreamInterface extends EventEmitterInterface
 {
     public function isWritable();
     public function write($data);
     public function end($data = null);
+    public function close();
 }