Updated to point to webtide.com, now HTTP/2 enabled.
Fixed typo.
Fixed a reentrancy issue that caused a stack overflow.

The case was that shutdown was called, ShutdownFlusherEntry called
flusher.close(), which called super.close(), which called
onCompleteFailure(), which looped over the active items to fail them,
calling again ShutdownFlusherEntry, which called again flusher.close(),
etc.