Prepare branch for merge in to master
- Add detection of Airbrake protocol based on port
- Add StatsD timing to Node and Airbrake requests
- Update default port for Airbrake API connections in config
- Add sleep to Airbrake test script so it can be left on loop
- Validate configuration for cluster worker count
Merge pull request #1 from WheresWardy/listen-only

Single-process application
This is the single-process version of the application. Originally it was designed to spawn separate processes for queuing Airbrake requests and sending them to Airbrake, but this needs more testing with regards to legitimate rate-limiting by Airbrake and the TTL of exceptions.