Add log module dependency.
Integrate log module, draft scheduler.
Log warning and exit on uncaught error.
Send rusage and memoryUsage() in tick.

Print heapUsed and maxrss.
0.1.43
Add client rejected (maxclients) debug log.
0.1.44
Sketch the pubsub mechanism.
Assert on pubsub logic (channels).
Include sub and psub in client list.
Add shared logic for channels and patterns.
Implement subscribe command.
Implement publish command.
Add unsubscribe command handler.
Implement psubscribe command.
Check psubscribe logic, appears to be working.

Requires tests.
0.1.45