utility queue-json to publish an arbitrary json blob to amqp
make drain-queue output actual json instead of python dict syntax
Merge pull request #31 from nlevitt/drain-republish

new utility queue-json, and another change to help with draining from and republishing to amqp
change publish routing key to "urls" to match queue name
Merge branch 'dev' of github.com:nlevitt/umbra into dev

Conflicts:
	bin/queue-json