1.9.4 (2013-09-19)
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o Properly return UNKNOWN from the HA REST API when the instance is neither
  master or slave.

1.9 (2013-05-13)
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o Arbiter instances now log into data/log/arbiter/messages.log

1.9.M05 (2013-03-05)
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o HA info REST endpoints now are called /db/manage/server/ha/{ismaster,isslave}, with getMaster no longer existing.

1.9.M04 (2013-01-17)
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o Includes new service endpoint, typically found under /db/manage/server/ha/{isMaster,getMaster}, with HA related info.
