[Buildbot] #3214: Document all Data API messages

[Buildbot trac]

#3214: Document all Data API messages
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Reporter:  dustin       |       Owner:
    Type:  enhancement  |      Status:  assigned
Priority:  major        |   Milestone:  0.9.0
 Version:  master       |  Resolution:
Keywords:  mq           |
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Comment (by sa2ajj):

 How can we "easily" determine what needs to be documented?

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Ticket URL: <http://trac.buildbot.net/ticket/3214#comment:3>
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