Fix warning about no consumers

There was no space between "there's" and "no". Might as well make it one line
since it's still less than 80 characters long.
Merge pull request #76 from drewish/fix-warning-message

Fix warning about no consumers
Allow namespace to include any valid rabbitmq queue name
Merge pull request #78 from gjohnson/master

Allow namespace to include any valid rabbitmq queue name
Update CHANGELOG.md