[Buildbot] #3184: Rewrite MailNotifier to use Data API

[Buildbot trac]

#3184: Rewrite MailNotifier to use Data API
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Reporter:  dustin  |       Owner:
    Type:  task    |      Status:  new
Priority:  major   |   Milestone:  0.9.0b1
 Version:  master  |  Resolution:
Keywords:          |
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Comment (by dustin):

 Note (per #3227) that the generated URLs need to be considered rather
 carefully, too.

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Ticket URL: <http://trac.buildbot.net/ticket/3184#comment:4>
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