[Buildbot] #3435: Install docs dependencies in setup.py

[Buildbot trac]

#3435: Install docs dependencies in setup.py
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Reporter:  dustin     |       Owner:  dustin
    Type:  undecided  |      Status:  new
Priority:  minor      |   Milestone:  0.9.+
 Version:             |  Resolution:
Keywords:             |
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Comment (by adityadivekar):

 So we need to include a docs tag in the extras_require field as follows,
 just like the test field -
 {{{
 'docs': [
           'sphinxcontrib-blockdiag 'docutils>=0.8''
         ]
 }}}
 This can be then installed by the user as you mentioned.

 Is this the right approach?

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Ticket URL: <http://trac.buildbot.net/ticket/3435#comment:4>
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