[Buildbot] #2642: Document Plugins

[Buildbot trac]

#2642: Document Plugins
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Reporter:  dustin       |       Owner:
    Type:  enhancement  |      Status:  new
Priority:  major        |   Milestone:  0.9.0
 Version:               |  Resolution:
Keywords:  plugins      |
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Comment (by dustin):

 Documentation by example is good, but needs actual *documentation* too,
 otherwise people will over- or under-generalize from the example.

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Ticket URL: <http://trac.buildbot.net/ticket/2642#comment:5>
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