Fix to have more than one queue with the same name

Now the list with references to the opened queues contains a
list of different connections to that queue-name.

This difficults the way of having references to the existing
queues in the way of:

connection.queues[queue-name]

because now returns a list of connections.
Merge branch 'master' of https://github.com/jgato/node-amqp

Conflicts:
	lib/connection.js