Merge branch '1.0' into 2.0

Author: terrafrost

phpseclib/Net/SSH2.php

@@ -3532,6 +3532,10 @@ function _filter($payload, $skip_channel_filter)
 
         // only called when we've already logged in
         if (($this->bitmap & self::MASK_CONNECTED) && $this->isAuthenticated()) {
+            if (is_bool($payload)) {
+                return $payload;
+            }
+
             switch (ord($payload[0])) {
                 case NET_SSH2_MSG_CHANNEL_REQUEST:
                     if (strlen($payload) == 31) {