[Buildbot] #2645: [nine] Implement Request Collapsing

[Buildbot trac]

#2645: [nine] Implement Request Collapsing
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Reporter:  dustin  |       Owner:  delanne
    Type:  task    |      Status:  accepted
Priority:  major   |   Milestone:  0.9.0
 Version:          |  Resolution:
Keywords:          |
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Comment (by delanne):

 See PR: https://github.com/buildbot/buildbot/pull/1261

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Ticket URL: <http://trac.buildbot.net/ticket/2645#comment:2>
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