Remove (handler-case ... (t ...)) usage from examples.
Error handling: use HANDLER-BIND instead of rethrowing, support passing through errors such as 5am test failures.
Fix APPLY usage in tests.
Fixed pipe cleanup during event loop shutdown.
Remove (handler-case ... (t ...)) usage from dns test.
Added WITH-TEST-EVENT-LOOP, CALLED-ONCE, NEVER and WAIT test helpers.
Process: more tests, don't crash upon failed uv_spawn(), added PROCESS-KILL.