[Buildbot] #3358: Require Twisted<15.4.0 for Python-2.6

[Buildbot trac]

#3358: Require Twisted<15.4.0 for Python-2.6
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Reporter:  dustin    |       Owner:  dustin
    Type:  task      |      Status:  new
Priority:  critical  |   Milestone:  0.9.0
 Version:            |  Resolution:
Keywords:            |
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Comment (by dustin):

 https://github.com/buildbot/buildbot/pull/1881

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Ticket URL: <http://trac.buildbot.net/ticket/3358#comment:1>
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