Simple demo BWL app

Fetch list of queues and corresponding priorities:
curl localhost:1974/queues

Enqueue "some data" into the "single" queue:
curl -X PUT -d "some data" localhost:1974/queues/single --header "Content-Type:text/plain"
Revert Bwl.definitions to original visibility.
Fix stupidity...
Merge pull request #23 from wajam/manu-demo

Simple demo BWL app