[Buildbot] #2844: make c['www']['url'] mandatory (was: c['www']['url'] should default to c['buildbotURL'])

[Buildbot trac]

#2844: make c['www']['url'] mandatory
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Reporter:  dustin       |       Owner:  ewong
    Type:  enhancement  |      Status:  assigned
Priority:  major        |   Milestone:  0.9.0
 Version:  0.8.9        |  Resolution:
Keywords:  simple       |
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Ticket URL: <http://trac.buildbot.net/ticket/2844#comment:3>
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