[Trac #172] Implement the activity chat overlay

[Zarro Boogs per Child]

#172: Implement the activity chat overlay
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 Reporter:  marco        |        Owner:  dcbw   
     Type:  enhancement  |       Status:  new    
 Priority:  normal       |    Milestone:  BTest-3
Component:  sugar        |   Resolution:         
 Keywords:               |  
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Changes (by marco):

  * milestone:  BTest-2 => BTest-3

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Ticket URL: <http://dev.laptop.org/ticket/172#comment:2>
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