Major request handler performance improvement. Benchmarks suggest number of requests/s improved by more than 50% for common GET requests! We now avoid queuing, buffering and wrapping incoming requests in promises when we're below limits and instead can directly process common requests. (#291, #292, #293, #294 and #296 by @clue)

Fix: Fix concurrent invoking next middleware request handlers (#293 by @clue)

Small code improvements (#286 by @seregazhuk)

Improve test suite to be less fragile when using ext-event and fix test suite forward compatibility with upcoming EventLoop releases (#288 and #290 by @clue)