Added the "sequence" data type support to AMQPReader/AMQPWriter classes. This particular data type (65) was causing a FrameSyntaxError when deserializing messages routed via a dead-letter exchange.  Perhaps this has something to do with the x-death header, and specifically the routing-keys parameter therein. Either way, this appears to be an AMQP 0.9.1 thing. The idea for this patch is pretty much ripped off from a similar patch to pyamqp-lib (http://code.google.com/p/py-amqplib/issues/detail?id=38).