Allow the iron.io cloud host to be set via the queue config file.

This will default to 'mq-aws-us-east-1.iron.io' if not set.  See http://dev.iron.io/mq/reference/clouds/ for more info.

Signed-off-by: Jay Hariani <jay@govtribe.com>
Make iron.io queue encryption optional.

If you're not using push queues, this makes viewing message data via iron.io's HUD impossible.
Merge branch 'master' of https://github.com/jhariani/framework