Add support for multilang heartbeats

[dan-blanchard]

apache/storm#286 isn't merged into Storm yet, but we're going to need to add support for the heartbeating it looks like they're going to add to the multilang protocol.

[amontalenti]

@dan-blanchard Nice catch! This looks like a nice project, indeed.

[HeartSaVioR]

FYI, It's merged to master, and planned to release at 0.9.3.

[dan-blanchard]

Fixed by #87 (and duplicate of #82).