Merge branch 'master' of https://github.com/manchicken/net-amqp-rabbitmq
moved extra tests back into normal tests as dev.rabbitmq.com is back

except for the transaction memory leak test as that's slooow
added queue delete method
doc fix to remove no_wait param from purge
changed tests to use unique exchange/queue/routing_key

based on hostname, os, perl ver as cpantesters tests were failing due to concurrent testing on different servers
fixed failing travis test