[Buildbot] #3255: Properties should send update events.

[Buildbot trac]

#3255: Properties should send update events.
--------------------+-----------------------
Reporter:  riziero  |       Owner:  tardyp
    Type:  defect   |      Status:  assigned
Priority:  major    |   Milestone:  0.9.0
 Version:  master   |  Resolution:
Keywords:           |
--------------------+-----------------------

Comment (by tardyp):

 https://github.com/buildbot/buildbot/pull/1899

--
Ticket URL: <http://trac.buildbot.net/ticket/3255#comment:13>
Buildbot <http://buildbot.net/>
Buildbot: build/test automation