Match log level of enqueue with dequeue.

Dequeue messages were being logged to INFO but enqueue messages were
being logged to DEBUG. DEBUG messages do not show up in stdout during
runtime.
Fixed error checking problem with Producer.
Fixed the JSON syntax for ScriptRequests
Cleaned up README.

Removed unimplemented API endpoints.
Added GET / and PUT /scripts endpoints.
Used actual example requests and responses.
Removed extraneous sections.
Fixed typo in README
Added Requirements section to docs
Moved license to it's own file.
Added Getting Started section to README
Added comments to sample config.
Renamed sample config file.
Added description of env vars to README.