-for 1.0
-=======
-review functionality missing over 0.1
-serialization of handle_events
-
for 1.1 or future
==================
optional timerfd support (runtime detection)
notifications of hotplugged/unplugged devices
offer API to create/destroy handle_events thread
isochronous sync I/O?
+exposing of parent-child device relationships
+"usb primer" introduction docs
+more examples