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Merge pull request #470 from mrb/patch-1

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Avoid leaking timers when doing DNS resolution

Previously, EM would start a timer whenever it connected to a DNS
server and never stop that timer.

Instead, only start the timer when a request is sent (meaning that the
timer isn't started when connecting to the DNS server if the result is
answerable from /etc/hosts), and stop it when there are no further
pending requests.

Based on patches by Greg Brockman <gdb@stripe.com>
Merge pull request #489 from ebroder/timer-leak

Avoid leaking timers when doing DNS resolution
Ensure file is read in binary mode.
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