FIX: Promise timeout should not addErrback
FIX: Promise timeout should not addErrback

Because now, we expect the exception to be thrown if no errback
is given, we can't let timeout() add an errback silently.

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,isaacs/nshtools,dreamllq/node,dreamllq/node