It's now possible to fire up multiple event loops in separate
goroutines. All that's needed is to set the `events.NumLoops` options
before calling `Serve`.
There are a few breaking API changes.
- The events pass an evio.Conn param that represents the unique
incoming socket connection.
- Prewrite and Postwrite events have been removed.
- Wake and Dial functions have been removed.
- The Transform utility has been removed.
The older version has been tagged as `v0.1.0` for vendoring purposes.