blog: Post for v0.11.9
events: fix TypeError in removeAllListeners

Check that `listeners` is actually an array before trying to manipulate it
because it won't be if no regular event listeners have been registered yet
but there are 'removeListener' event listeners.
doc: clarify child_process error behaviour

Clarify that an 'error' event may or may not be followed by an 'exit'
event and that it's not safe to make assumptions either way.
blog: npm outage postmortem
Merge remote-tracking branch 'upstream/v0.10'