uasyncio: start_server(): Add listen backlog arg, default to 10.
uasyncio: Add instructions for testing/benchmarking.
uasyncio: Add automated script for performance testing with Apache Bench.
uasyncio.core: Typo fix in recently added .create_task() method.
uasyncio.core: Update description, don't bite at asyncio's side ;-).
logging: Set default level as INFO, DEBUG is too spammy.