[Buildbot] #2844: c['www']['url'] should default to c['buildbotURL']

[Buildbot trac]

#2844: c['www']['url'] should default to c['buildbotURL']
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Reporter:  dustin       |      Owner:
    Type:  enhancement  |     Status:  new
Priority:  major        |  Milestone:  0.9.0
 Version:  0.8.9        |   Keywords:  simple
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 This just tripped me up in
 https://github.com/buildbot/buildbot/pull/1187#issuecomment-50669471

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Ticket URL: <http://trac.buildbot.net/ticket/2844>
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