preaction / Mercury / 86

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travis-ci

add ping to try to expire broken connections

I've been having problems with connections breaking through a proxy. The
connection is live, but no data is sent through, even data that is known
to have been sent.

In theory, by sending keep-alive pings, we can better know if the
connection is dead early.

Fixes #38

10 of 10 new or added lines in 1 file covered. (100.0%)

227 of 235 relevant lines covered (96.6%)

5.47 hits per line