Step 1 of the big rewrite.

This is a total re-write of the daemons Gem. It introduces better daemonization
(one that actually works), easier handling of concurrency (using good ol' Oni),
tests, documentation and a clear definition of the SQS input format using
JSON-schema.

This also introduces support for profiling daemons using New Relic and tracking
errors using Rollbar. This allows users to have better insight in the processing
flow when using OpeNER daemons.